Unitest failing with python 3.8

Some unit tests are failing with python3.8 environment.

======================================================================
FAIL: cinder.tests.unit.test_hacking.HackingTestCase.test_logging_format_args
cinder.tests.unit.test_hacking.HackingTestCase.test_logging_format_args
----------------------------------------------------------------------
testtools.testresult.real._StringException: pythonlogging:'': {{{
2020-01-31 14:42:00,196 INFO [keystonemiddleware.auth_token] Starting Keystone auth_token middleware
2020-01-31 14:42:00,200 WARNING [keystonemiddleware._common.config] The option "auth_url" is not known to keystonemiddleware
2020-01-31 14:42:00,201 WARNING [keystonemiddleware.auth_token] AuthToken middleware is set with keystone_authtoken.service_token_roles_required set to False. This is backwards compatible but deprecated behaviour. Please set this to True.
2020-01-31 14:42:00,204 WARNING [keystonemiddleware.auth_token] Configuring www_authenticate_uri to point to the public identity endpoint is required; clients may not be able to authenticate against an admin endpoint
}}}

Traceback (most recent call last):
  File "/<<PKGBUILDDIR>>/cinder/tests/unit/test_hacking.py", line 176, in test_logging_format_args
    self._assert_has_errors(code.format(method), checker,
  File "/<<PKGBUILDDIR>>/cinder/tests/unit/test_hacking.py", line 152, in _assert_has_errors
    self.assertEqual(expected_errors or [], actual_errors)
  File "/usr/lib/python3/dist-packages/testtools/testcase.py", line 411, in assertEqual
    self.assertThat(observed, matcher, message)
  File "/usr/lib/python3/dist-packages/testtools/testcase.py", line 498, in assertThat
    raise mismatch_error
testtools.matchers._impl.MismatchError: [(4, 21, 'C310')] != [(4, 20, 'C310')]

======================================================================
FAIL: cinder.tests.unit.test_hacking.HackingTestCase.test_opt_type_registration_args
cinder.tests.unit.test_hacking.HackingTestCase.test_opt_type_registration_args
----------------------------------------------------------------------
testtools.testresult.real._StringException: pythonlogging:'': {{{
2020-01-31 14:42:06,075 INFO [keystonemiddleware.auth_token] Starting Keystone auth_token middleware
2020-01-31 14:42:06,080 WARNING [keystonemiddleware._common.config] The option "auth_url" is not known to keystonemiddleware
2020-01-31 14:42:06,080 WARNING [keystonemiddleware.auth_token] AuthToken middleware is set with keystone_authtoken.service_token_roles_required set to False. This is backwards compatible but deprecated behaviour. Please set this to True.
2020-01-31 14:42:06,083 WARNING [keystonemiddleware.auth_token] Configuring www_authenticate_uri to point to the public identity endpoint is required; clients may not be able to authenticate against an admin endpoint
}}}

Traceback (most recent call last):
  File "/<<PKGBUILDDIR>>/cinder/tests/unit/test_hacking.py", line 205, in test_opt_type_registration_args
    self._assert_has_errors(code, checker,
  File "/<<PKGBUILDDIR>>/cinder/tests/unit/test_hacking.py", line 152, in _assert_has_errors
    self.assertEqual(expected_errors or [], actual_errors)
  File "/usr/lib/python3/dist-packages/testtools/testcase.py", line 411, in assertEqual
    self.assertThat(observed, matcher, message)
  File "/usr/lib/python3/dist-packages/testtools/testcase.py", line 498, in assertThat
    raise mismatch_error
testtools.matchers._impl.MismatchError: !=:
reference = [(1, 18, 'C311'), (2, 19, 'C311'), (3, 19, 'C311'), (4, 19, 'C311')]
actual = [(1, 18, 'C311'), (2, 18, 'C311'), (3, 19, 'C311'), (4, 18, 'C311')]