[rgmanager] Use /cluster/rm instead of //rm
[rgmanager] Use /cluster/rm instead of //rm

 * It is more efficient
 * It is a well-defined location

stevenraspudic/resource-agents,stevenraspudic/resource-agents,asp24/resource-agents,stevenraspudic/resource-agents,asp24/resource-agents,asp24/resource-agents