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: I2695f5a2371babfbf2a16565ff2ce5205a45fd2c

devstack/swift_config.py

@@ -180,8 +180,8 @@ def patch_swift_storlet_proxy_file(conf):
             # client configuration (we encountered this problem in a fuel swift
             # cluster).
             if 'proxy-logging' in line:
-                line = 'pipeline = proxy-logging cache storlet_handler slo ' + \
-                       'proxy-logging proxy-server\n'
+                line = ('pipeline = proxy-logging cache storlet_handler slo '
+                        'proxy-logging proxy-server\n')
             else:
                 line = 'pipeline = cache storlet_handler slo proxy-server\n'
         sys.stdout.write(line)
@@ -245,5 +245,6 @@ def main(argv):
     else:
         usage(argv)
 
+
 if __name__ == "__main__":
     main(sys.argv)

storlets/gateway/gateways/docker/runtime.py

@@ -183,6 +183,7 @@ class RunTimePaths(object):
     def host_dependency_cache_dir(self):
         return os.path.join(self.host_cache_root_dir, self.scope, 'dependency')
 
+
 """---------------------------------------------------------------------------
 Docker Stateful Container API
 The RunTimeSandbox serve as an API between the Docker Gateway and
@@ -465,6 +466,7 @@ class RunTimeSandbox(object):
             else:
                 self.logger.debug('Daemon started')
 
+
 """---------------------------------------------------------------------------
 Storlet Daemon API
 StorletInvocationProtocol

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>=0.11.0,<0.12
+hacking>=3.0,<3.1.0 # Apache-2.0
 
 coverage>=3.6
 nose

tox.ini

@@ -86,7 +86,9 @@ commands =
 # H306: imports not in alphabetical order (time, os)
 # H404: multi line docstring should start without a leading new line
 # H405: multi line docstring summary not separated with an empty line
-ignore = E123,E125,H301,H306,H404,H405
+# W503 line break before binary operator
+# W504 line break after binary operator
+ignore = E123,E125,H301,H306,H404,H405,W503,W504
 show-source = True
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build