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
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"