ofagent: Remove obsolete bridge_mappings (plugin side)

For ofagent, it has been superseded by physical_interface_mappings
and was planned to be removed in Kilo.

Related: blueprint ofagent-physical-interface-mappings
Change-Id: I1f7cbcde429a03e7e918dc224d8cbd8c6aa47049
CSCO:Tenants not to access unshared n/w profiles

Ensure that a n1kv tenant who has no access to a network profile
belonging to some other tenant, is not allowed to modify that profile.
Currently, a tenant can create networks on any network profile if he
has the network profile id.

Change-Id: I53d767acceaa5e2c08e75e6f18847f659cda8d8b
Closes-Bug: 1365727
Drop RpcProxy usage from MeteringAgentNotifyAPI

Remove usage of the RpcProxy compatibility class from
MeteringAgentNotifyAPI.  The equivalent oslo.messaging APIs are now
used instead.

Part of blueprint drop-rpc-compat.

Change-Id: I6c1fddb6694f74021b9f6a54885657916bda2875
Merge "ofagent: Remove obsolete bridge_mappings (plugin side)"
Merge "Drop RpcProxy usage from MeteringAgentNotifyAPI"
Merge "CSCO:Tenants not to access unshared n/w profiles"