Drop RpcProxy usage from VPNaaS code

Drop the usage of the RpcProxy compatibility class from the VPNaaS
code.  The equivalent direct usage of oslo.messaging APIs is now used
instead.

Part of blueprint drop-rpc-compat.

Change-Id: I4ff0bfe0b5e909bfe088f4059d85aa6366526dad
Enforce log hints in neutron.services.metering

This change enforces log hints use and removes debug level log
translation, modifications are validated through a hacking rule.

Validate that hacking rules apply to directories:
    - neutron/services/metering

Change-Id: Ic763e81e8b06973013115af45c7c09a3e69c673b
Partial-bug: #1320867
Enforce log hints in neutron.services

This change enforces log hints use and removes debug level log
translation, modifications are validated through a hacking rule.

Validate that hacking rules apply to directories:
    - neutron/services

Change-Id: Ib744b7a94705afbefeb50b5dce933d226831f580
Partial-bug: #1320867
Merge "Drop RpcProxy usage from VPNaaS code"
Merge "Enforce log hints in neutron.services.metering"
Merge "Enforce log hints in neutron.services"