Clean up removed hacking rule from [flake8] ignore lists

We bump hacking>=0.10.0, and hacking removed some rules,
for the full list of rules please see [1]. So don't need them any more.

[1]https://github.com/openstack-dev/hacking/blob/master/setup.cfg#L30

Change-Id: I61b57fc7c958a869bc97d1cb73d447413f60cebd

castellan/key_manager/__init__.py

@@ -28,4 +28,4 @@ def API(configuration=None):
     conf.register_opts(key_manager_opts, group='key_manager')
 
     cls = importutils.import_class(conf.key_manager.api_class)
-    return cls(configuration=conf)
+    return cls(configuration=conf)

test-requirements.txt

@@ -1,8 +1,7 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-
-hacking<0.10,>=0.9.2
+hacking>=0.10.2,<0.11 # Apache-2.0
 
 coverage>=3.6 # Apache-2.0
 discover # BSD

tox.ini

@@ -48,5 +48,5 @@ commands =
 # E123, E125 skipped as they are invalid PEP-8.
 
 show-source = True
-ignore = E123,E125,H803
+ignore = E123,E125
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build