OCF RA: Use rabbitmqctl_action wrapper for stop action

We want to use the wrapper function to call rabbitmqctl for stop, so
that we interpret correctly the exit code.

scripts/rabbitmq-server.ocf

@@ -299,7 +299,7 @@ rabbit_stop() {
         return $OCF_SUCCESS
     fi
 
-    $RABBITMQ_CTL stop ${RABBITMQ_PID_FILE}
+    rabbitmqctl_action stop ${RABBITMQ_PID_FILE}
     rc=$?
 
     if [ "$rc" != 0 ]; then