Enforce log hints in neutron.plugins.sriovnicagent

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/sriovnicagent

Partial-bug: #1320867

Change-Id: Idde3d69c982db49e6b1510d6a6094af82fa25b13
Merge "Enforce log hints in neutron.plugins.sriovnicagent"