wrong flake8 exception

In the manila/tox.ini

[flake8]
# Following checks are ignored on purpose:
#
# H904 wrap long lines in parentheses instead of a backslash
# reason: removed in hacking (https://review.openstack.org/#/c/101701/)
ignore = H904
builtins = _
exclude = .venv,.tox,dist,doc,openstack,*egg

all 'openstack' directories are excluded. This rule is intended to exclude manila/openstack/common code check, but this rule is wrong because it also exclude checks against manila/api/openstack and manila/tests/api/openstack. We should fix it

The following are detail violations:

./manila/api/openstack/__init__.py:27:1: F401 'utils' imported but unused
./manila/api/openstack/__init__.py:61:1: H404 multi line docstring should start without a leading new line
./manila/api/openstack/__init__.py:61:1: H405 multi line docstring summary not separated with an empty line
./manila/api/openstack/__init__.py:66:2: H402 one line docstring needs punctuation.
./manila/api/openstack/api_version_request.py:179:1: W391 blank line at end of file
./manila/api/openstack/wsgi.py:145:1: H405 multi line docstring summary not separated with an empty line
./manila/api/openstack/wsgi.py:153:1: H405 multi line docstring summary not separated with an empty line
./manila/api/openstack/wsgi.py:161:1: H405 multi line docstring summary not separated with an empty line
./manila/api/openstack/wsgi.py:264:2: H402 one line docstring needs punctuation.
./manila/api/openstack/wsgi.py:287:2: H402 one line docstring needs punctuation.
./manila/api/openstack/wsgi.py:297:2: H402 one line docstring needs punctuation.
./manila/api/openstack/wsgi.py:561:1: H404 multi line docstring should start without a leading new line
./manila/api/openstack/wsgi.py:561:1: H405 multi line docstring summary not separated with an empty line
./manila/api/openstack/wsgi.py:733:9: M329 LOG.info messages require translations `_LI()`!
./manila/api/openstack/wsgi.py:733:9: M331 Log messages require translations!
./manila/api/openstack/wsgi.py:1062:21: E127 continuation line over-indented for visual indent
./manila/api/openstack/wsgi.py:1197:54: H702 Use bare string concatenation instead of +
./manila/api/openstack/wsgi.py:1321:9: F841 local variable 'metadata' is assigned to but never used
./manila/tests/api/openstack/__init__.py:17:1: F403 'from manila.tests import *' used; unable to detect undefined names
./manila/tests/api/openstack/__init__.py:17:26: H303 No wildcard (*) import.
./manila/tests/api/openstack/test_api_version_request.py:40:80: E501 line too long (88 > 79 characters)
./manila/tests/api/openstack/test_api_version_request.py:46:80: E501 line too long (88 > 79 characters)
./manila/tests/api/openstack/test_wsgi.py:1:1: H102 Apache 2.0 license header not found
./manila/tests/api/openstack/test_wsgi.py:2:1: H305 imports not grouped correctly (ddt: third-party, inspect: stdlib)
./manila/tests/api/openstack/test_wsgi.py:3:1: H305 imports not grouped correctly (inspect: stdlib, mock: third-party)
./manila/tests/api/openstack/test_wsgi.py:164:80: E501 line too long (86 > 79 characters)
./manila/tests/api/openstack/test_wsgi.py:574:13: F841 local variable 'resp_obj' is assigned to but never used
./manila/tests/api/openstack/test_wsgi.py:579:13: F841 local variable 'resp_obj' is assigned to but never used
./manila/tests/api/openstack/test_wsgi.py:701:13: F841 local variable 'resp_obj' is assigned to but never used
./manila/tests/api/openstack/test_wsgi.py:705:13: F841 local variable 'resp_obj' is assigned to but never used
./manila/tests/api/openstack/test_wsgi.py:730:13: F841 local variable 'resp_obj' is assigned to but never used
./manila/tests/api/openstack/test_wsgi.py:734:13: F841 local variable 'resp_obj' is assigned to but never used
./manila/tests/api/openstack/test_wsgi.py:872:1: E302 expected 2 blank lines, found 1