init_host should be called before RPC consumer is created

Currently, the init_host method is called after RPC consumer is
created. This behavior will lead to a bug that when a rpc request
is received the manager can not handle it because the driver has not
been initialized!

Change-Id: Ieedba1adeb3dd98eb4ff78427fe347423c016469
Closes-Bug: #1271568

cinder/service.py

@@ -100,6 +100,7 @@ class Service(service.Service):
         LOG.audit(_('Starting %(topic)s node (version %(version_string)s)'),
                   {'topic': self.topic, 'version_string': version_string})
         self.model_disconnected = False
+        self.manager.init_host()
         ctxt = context.get_admin_context()
         try:
             service_ref = db.service_get_by_args(ctxt,
@@ -117,8 +118,6 @@ class Service(service.Service):
         self.rpcserver = rpc.get_server(target, endpoints)
         self.rpcserver.start()
 
-        self.manager.init_host()
-
         if self.report_interval:
             pulse = loopingcall.LoopingCall(self.report_state)
             pulse.start(interval=self.report_interval,