Network: add instance to the debug statement

Allocating and deallocating a network from an instance needs
more info to debug especially when more than one instance
has the same name.

The same change is also made regarding exceptions. That is,
the instance UUID will be used instead of the name.

Change-Id: I624fe77c71f6cb7ca453c863b59f0452c8e6b383
Don't translate debug level logs in nova

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).

This is the final patch ensuring that all fines in the nova directory
no longer have translations for debug messages.

Change-Id: Ib10f5826e2238cbb2d4315c48be570eb31b2ea55
Merge "Don't translate debug level logs in nova"
Merge "Network: add instance to the debug statement"