`make test` Failures

On latest `main` and a fresh configure

- Ubuntu 20.04, 
- python 3.8.5, and 
- psql 12.6

Traceback:

```
▶ make test
-> Run the test suite
bin/python manage.py test --noinput
/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/cluecode/copyrights.py:3122: FutureWarning: Possible set difference at position 3
  remove_tags = re.compile(
/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/nltk/tag/sequential.py:540: FutureWarning: Possible nested set at position 7
  self._regexps = [(re.compile(regexp), tag,) for regexp, tag in regexps]
Creating test database for alias 'default'...
System check identified no issues (0 silenced).
...............................................................................................................................EE.E............................
======================================================================
ERROR: test_scanpipe_pipes_scancode_scan_for_files (scanpipe.tests.test_pipes.ScanPipePipesTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
psycopg2.OperationalError: SSL SYSCALL error: EOF detected


The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib/python3.8/unittest/mock.py", line 1325, in patched
    return func(*newargs, **newkeywargs)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/scanpipe/tests/test_pipes.py", line 323, in test_scanpipe_pipes_scancode_scan_for_files
    resource.refresh_from_db()
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/base.py", line 637, in refresh_from_db
    db_instance = db_instance_qs.get()
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/query.py", line 431, in get
    num = len(clone)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/query.py", line 262, in __len__
    self._fetch_all()
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/query.py", line 1324, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/query.py", line 51, in __iter__
    results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1169, in execute_sql
    cursor.execute(sql, params)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/utils.py", line 66, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/utils.py", line 75, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/utils.py", line 90, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
django.db.utils.OperationalError: SSL SYSCALL error: EOF detected


======================================================================
ERROR: test_scanpipe_pipes_scancode_virtual_codebase (scanpipe.tests.test_pipes.ScanPipePipesTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/base/base.py", line 237, in _cursor
    return self._prepare_cursor(self.create_cursor(name))
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/postgresql/base.py", line 236, in create_cursor
    cursor = self.connection.cursor()
psycopg2.InterfaceError: connection already closed

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/scanpipe/tests/test_pipes.py", line 328, in test_scanpipe_pipes_scancode_virtual_codebase
    project = Project.objects.create(name="asgiref")
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/query.py", line 453, in create
    obj.save(force_insert=True, using=self.db)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/scanpipe/models.py", line 213, in save
    super().save(*args, **kwargs)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/base.py", line 726, in save
    self.save_base(using=using, force_insert=force_insert,
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/base.py", line 763, in save_base
    updated = self._save_table(
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/base.py", line 868, in _save_table
    results = self._do_insert(cls._base_manager, using, fields, returning_fields, raw)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/base.py", line 906, in _do_insert
    return manager._insert(
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/query.py", line 1270, in _insert
    return query.get_compiler(using=using).execute_sql(returning_fields)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1408, in execute_sql
    with self.connection.cursor() as cursor:
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/base/base.py", line 259, in cursor
    return self._cursor()
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/base/base.py", line 237, in _cursor
    return self._prepare_cursor(self.create_cursor(name))
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/utils.py", line 90, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/base/base.py", line 237, in _cursor
    return self._prepare_cursor(self.create_cursor(name))
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/postgresql/base.py", line 236, in create_cursor
    cursor = self.connection.cursor()
django.db.utils.InterfaceError: connection already closed

======================================================================
ERROR: test_scanpipe_pipes_tag_not_analyzed_codebase_resources (scanpipe.tests.test_pipes.ScanPipePipesTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/base/base.py", line 237, in _cursor
    return self._prepare_cursor(self.create_cursor(name))
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/postgresql/base.py", line 236, in create_cursor
    cursor = self.connection.cursor()
psycopg2.InterfaceError: connection already closed

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/scanpipe/tests/test_pipes.py", line 75, in test_scanpipe_pipes_tag_not_analyzed_codebase_resources
    p1 = Project.objects.create(name="Analysis")
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/query.py", line 453, in create
    obj.save(force_insert=True, using=self.db)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/scanpipe/models.py", line 213, in save
    super().save(*args, **kwargs)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/base.py", line 726, in save
    self.save_base(using=using, force_insert=force_insert,
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/base.py", line 763, in save_base
    updated = self._save_table(
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/base.py", line 868, in _save_table
    results = self._do_insert(cls._base_manager, using, fields, returning_fields, raw)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/base.py", line 906, in _do_insert
    return manager._insert(
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/query.py", line 1270, in _insert
    return query.get_compiler(using=using).execute_sql(returning_fields)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1408, in execute_sql
    with self.connection.cursor() as cursor:
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/base/base.py", line 259, in cursor
    return self._cursor()
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/base/base.py", line 237, in _cursor
    return self._prepare_cursor(self.create_cursor(name))
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/utils.py", line 90, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/base/base.py", line 237, in _cursor
    return self._prepare_cursor(self.create_cursor(name))
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/home/ayan/Desktop/nexB/main_repos/scancode.io/lib/python3.8/site-packages/django/db/backends/postgresql/base.py", line 236, in create_cursor
    cursor = self.connection.cursor()
django.db.utils.InterfaceError: connection already closed

----------------------------------------------------------------------
Ran 159 tests in 111.855s

FAILED (errors=3)
Destroying test database for alias 'default'...
make: *** [Makefile:116: test] Error 1

```
Though running the scan_codebase  pipeline works perfectly on a couple of files.


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`make test` Failures #145

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`make test` Failures #145