Updated openstack/openstack
Project: openstack/neutron  58c0d58ec68058b8f6f718a0b230f0dd59a9937e

Drop usage of RpcProxy from L3PluginApi

Drop the usage of the RpcProxy compatibility class from the
L3PluginApi.  The equivalent direct usage of the oslo.messaging APIs
are now being used instead.

Part of blueprint drop-rpc-compat.

Change-Id: I6639d1aa8acca8c0544020e28489e71f3d5d2955