failed to set gateway interface to router

[yong sheng gong]

it seems we lack some rpc functions in endpoint at https://github.com/openstack/astara/blob/master/astara/notifications.py#L94:

2016-05-12 17:40:34.449 ERROR oslo_messaging.rpc.dispatcher:17512:notification-listener:Thread-10 Exception during message handling: Endpoint does not support RPC method routers_updated
2016-05-12 17:40:34.449 17512 ERROR oslo_messaging.rpc.dispatcher Traceback (most recent call last):
2016-05-12 17:40:34.449 17512 ERROR oslo_messaging.rpc.dispatcher File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 138, in _dispatch_and_reply
2016-05-12 17:40:34.449 17512 ERROR oslo_messaging.rpc.dispatcher incoming.message))
2016-05-12 17:40:34.449 17512 ERROR oslo_messaging.rpc.dispatcher File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 192, in _dispatch
2016-05-12 17:40:34.449 17512 ERROR oslo_messaging.rpc.dispatcher raise NoSuchMethod(method)
2016-05-12 17:40:34.449 17512 ERROR oslo_messaging.rpc.dispatcher NoSuchMethod: Endpoint does not support RPC method routers_updated