Fix the deprecated usage of "get_transport"

As log says, 'oslo_messaging.transport.get_transport()' is deprecated.
The reference link of oslo_messaging is at [1].

[1] https://review.openstack.org/#/c/454194/

Change-Id: Ib4e8cc7b30a7541221d9ae2d244577b2dae5518d

qinling/engine/service.py

@@ -44,7 +44,7 @@ class EngineService(service.Service):
 
         topic = CONF.engine.topic
         server = CONF.engine.host
-        transport = messaging.get_transport(CONF)
+        transport = messaging.get_rpc_transport(CONF)
         target = messaging.Target(topic=topic, server=server, fanout=False)
         endpoints = [engine.DefaultEngine(orchestrator)]
         access_policy = dispatcher.DefaultRPCAccessPolicy