debug level logs should not be translated

According to the OpenStack translation policy available at
https://wiki.openstack.org/wiki/LoggingStandards debug messages
should not be translated. Like mentioned in several changes in
Nova by garyk this is to help prioritize log translation.

Change-Id: Idd917acd97481d6b644e307adb002354b37f34a1
Merge "debug level logs should not be translated"