Enforce log hints in ofagent and oneconvergence

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/ofagent
    neutron/plugins/oneconvergence

Change-Id: I520a36ae53848b828ce33f4050606a7238f4cbce
Partial-bug: #1320867
Merge "Enforce log hints in ofagent and oneconvergence"