Fix L2 agent does not remove unused ipset set

The patch fixes L2 agent does not remove unused ipset set when security
group contains rules for only IPv4 or IPv6.

Change-Id: I375b1683cd763c0a33dc935558c637874d36ffa1
Closes-bug: #1373287
enable F812 check for flake8

The change removes the shadowed variable in list comprehensions and
enables the F812 check

Change-Id: If7b4d6f198795565fe0d8e7524b73555e310cd14
Partial-Bug: 1329017
Update i18n translation for neutron.agents log msg's

Don't translate debug level logs and enforce log hints
Our translation policy
(https://wiki.openstack.org/wiki/LoggingStandards#Log_Translation) calls
for not translating debug level logs. This is to help prioritize log
translation. Furthermore translation has a performance overhead, even if
the log isn't used (since neutron doesn't support lazy translation yet).

NOTE: this is done on a directory by directory basis to ensure that we
do not have too many conflicts and rebases.

Add a local hacking rule to enforce this.

This patch set enforces the directory neutron/agents

Partial-bug: #1320867

Change-Id: I4bd562e5138c2d2850072440aa121f27e902463a
Update i18n translation for neutron.cmd log msg's

Validate that hacking rules apply to directory neutron/cmd

Change-Id: I7fbeba035e8a7f7602fef96a0e10cec5298b08f3
Partial-bug: #1320867
Drop usage of RpcProxy from DhcpPluginApi

Drop the usage of the RpcProxy compatibility class from the
DhcpPluginApi RPC client class.  The implementation has been updated
to use the appropariate APIs from oslo.messaging directly.

Part of blueprint drop-rpc-compat.

Change-Id: I81bfd761707c4c587b12877668c4399efe3d652e
Fix client side versions in dhcp rpc API

The dhcp rpc API has two version (1.0 and 1.1).  The proper way to use
versioning for this is to only specify '1.1' from the client side when
you require that the remote side implements at least version '1.1' for
the method to work.  Otherwise, '1.0' should still be specified.  The
previous code specified '1.1' always.

Related to blueprint drop-rpc-compat.

Change-Id: I9468f8f67d80c5d064137f917fc04f9335a3ed55
Merge "Fix L2 agent does not remove unused ipset set"
Merge "enable F812 check for flake8"
Merge "Update i18n translation for neutron.agents log msg's"
Merge "Update i18n translation for neutron.cmd log msg's"