Removed 'rpc' and 'notifier' incubator modules

Port to oslo.messaging is done, so remove now unused pieces from the
tree.

Also removed obsolete bin/quantum-rpc-zmq-receiver. It comes from old
days of oslo-rpc, it was reimplemented later as
openstack/common/rpc/zmq_receiver.py in oslo-incubator, and we've
removed the whole tree for old RPC layer anyway.

blueprint oslo-messaging

Change-Id: If7155c59c8ef58d06164938998180f3367b9bb16

openstack-common.conf

@@ -19,11 +19,9 @@ module=log_handler
 module=loopingcall
 module=middleware
 module=network_utils
-module=notifier
 module=periodic_task
 module=policy
 module=processutils
-module=rpc
 module=service
 module=sslutils
 module=strutils