Fix flake8 errors

tests/unit/test_audit_gdm_last_user_logged_in_disabled.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python3
 
-import os
 from unittest.mock import mock_open, patch
 
 import pytest

tests/unit/test_audit_gdm_login_banner_configure.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python3
 
-import os
 from unittest.mock import mock_open, patch
 
 import pytest

tests/unit/test_is_test_included.py

@@ -2,7 +2,6 @@
 
 import argparse
 import logging
-from types import SimpleNamespace
 from unittest.mock import patch
 
 import pytest

tests/unit/test_run_tests.py

@@ -209,6 +209,5 @@ def test_run_tests_error_not_implemented(self, caplog):
         assert result == [{'_id': test_args['_id'], 'description': test_args['description'], 'level': test_args['levels']['server'], 'result': 'Not Implemented'}]
 
 
-
 if __name__ == '__main__':
     pytest.main([__file__, '--no-cov'])