Don't translate debug level 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.

Related-Bug: #1318333

Change-Id: I0d6425fcf2c55d3cdab1dbfaa4bf698b1a33841c
Merge "Don't translate debug level logs"