NoSuchMethod: Endpoint does not support RPC method routers_updated

[Adam Gandelman]

Noticed the following in our logs during router creation/update:

2016-05-25 00:13:53.785 ERROR oslo_messaging.rpc.server:25390:notification-listener:Thread-2 Exception during handling message
2016-05-25 00:13:53.785 25390 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2016-05-25 00:13:53.785 25390 ERROR oslo_messaging.rpc.server File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/server.py", line 133, in _process_incoming
2016-05-25 00:13:53.785 25390 ERROR oslo_messaging.rpc.server res = self.dispatcher.dispatch(message)
2016-05-25 00:13:53.785 25390 ERROR oslo_messaging.rpc.server File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 160, in dispatch
2016-05-25 00:13:53.785 25390 ERROR oslo_messaging.rpc.server raise NoSuchMethod(method)
2016-05-25 00:13:53.785 25390 ERROR oslo_messaging.rpc.server NoSuchMethod: Endpoint does not support RPC method routers_updated
2016-05-25 00:13:53.785 25390 ERROR oslo_messaging.rpc.server

This might be do the recent changes to our messaging layer, perhaps the RPC server is not being setup correctly?