Use rabbitmq_service_name var for service handler

handlers/main.yml

@@ -1,7 +1,7 @@
 ---
 
   - name: restart rabbitmq service
-    service: name=rabbitmq state=restarted
+    service: name={{ rabbitmq_service_name }} state=restarted
   
   - name: restart uchiwa service
     service: name=uchiwa state=restarted