Updated openstack/openstack
Project: openstack/neutron  a4863e54b1e944444e5e90972ef3df18fbf2ca01

Renamed start_rpc_listener -> start_rpc_listeners

Now that we explicitly start multiple RPC servers, renamed the method to
reflect behaviour.

blueprint oslo-messaging

Change-Id: I7c51cc1b44b4b4c8899255b9bedce1792c38634e