Don't translate debug level scheduler logs

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 nova doesn't support lazy translation yet).

Remove unnecessary debug level log translation in the scheduler to
comply with our translation policy. This has the added benefit of making
the scheduler slightly faster too.

Add a local hacking rule to enforce this.

Change-Id: Ie1068d2d2c7c37f27c62d0e4e5a64a1a504af9f5
Merge "Don't translate debug level scheduler logs"