fix rpc_backend option

Change-Id: Ibb6dd23d1c783fd5c9c7cfdfd3e7d0039602af86
diff --git a/cinder/files/mitaka/cinder.conf.controller.Debian b/cinder/files/mitaka/cinder.conf.controller.Debian
index 66ef1ea..30f464b 100644
--- a/cinder/files/mitaka/cinder.conf.controller.Debian
+++ b/cinder/files/mitaka/cinder.conf.controller.Debian
@@ -46,7 +46,7 @@
 rpc_response_timeout=3600
 
 #Rabbit
-rpc_backend=cinder.openstack.common.rpc.impl_kombu
+rpc_backend=rabbit
 control_exchange=cinder
 
 
diff --git a/cinder/files/mitaka/cinder.conf.volume.Debian b/cinder/files/mitaka/cinder.conf.volume.Debian
index 862d621..7212a24 100644
--- a/cinder/files/mitaka/cinder.conf.volume.Debian
+++ b/cinder/files/mitaka/cinder.conf.volume.Debian
@@ -46,7 +46,7 @@
 rpc_response_timeout=3600
 
 #Rabbit
-rpc_backend=cinder.openstack.common.rpc.impl_kombu
+rpc_backend=rabbit
 control_exchange=cinder