Enforce log hints in opencontrail

This change enforces log hints use and removes debug level log
translation, modifications are validated through a hacking rule
and the change respects loggging guidelines. Validate that hacking
rules apply to directories:- neutron/plugins/opencontrail

Change-Id: I44f215a672c08c7f0046bc026abe7c6a5d1697d1
Partial-bug: #1320867
Merge "Enforce log hints in opencontrail"