'Raise events for node configuration notifications.'

def _handle_event_configuration(self, msg):

    node = msg['pubsub_event']['configuration']['node']
    event_name = self.node_event_map.get(node, None)
    self.xmpp.event('pubsub_config', msg)
    if event_name:
        self.xmpp.event(('%s_config' % event_name), msg)
