Update hacking for Python3

The repo is Python 3 now, so update hacking to version 3.0 which
supports Python 3.

Fix problems found.

Change-Id: I16995f9237168d16c834662876683760127aabb3

test-requirements.txt

@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-hacking<0.13,>=0.12.0 # Apache-2.0
+hacking>=3.0,<3.1.0 # Apache-2.0
 
 sphinx>=2.0.0,!=2.1.0 # BSD
 openstackdocstheme>=2.0.0 # Apache-2.0

tox.ini

@@ -38,8 +38,9 @@ commands = oslo_debug_helper {posargs}
 
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.
+# W504 line break after binary operator
 
 show-source = True
-ignore = E123,E125
+ignore = E123,E125,W504
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build

zun_tempest_plugin/tests/tempest/api/clients.py

@@ -118,8 +118,8 @@ class ZunClient(rest_client.RestClient):
     def request(self, *args, **kwargs):
         resp, resp_body = super(ZunClient, self).request(*args, **kwargs)
         if (CONTAINER_SERVICE_MICROVERSION and
-            CONTAINER_SERVICE_MICROVERSION
-                != api_version_utils.LATEST_MICROVERSION):
+            CONTAINER_SERVICE_MICROVERSION !=
+                api_version_utils.LATEST_MICROVERSION):
             api_version_utils.assert_version_header_matches_request(
                 self.api_microversion_header_name,
                 get_container_service_api_version(),