Revoved variable rpc_backend; alresdy defined

manifests/profile/ceilometer/common.pp

@@ -13,7 +13,6 @@ class iaas::profile::ceilometer::common (
     metering_secret => $secret,
 #added rabbit_hosts
 #    rabbit_hosts => [ $endpoint ],
-    rpc_backend => 'rabbit',
     rabbit_hosts => $rhosts,
     rabbit_userid => $rabbitmq_user,
     rabbit_password => $rabbitmq_password,