PATCH: http://patches.gluster.com/patch/4760 in master (mgmt/glusterd: make probe one way)
at the moment, probe command has to be executed on two machines to make them both friends of each other. We should make this happen using just one command on the machine with in the cluster.
PATCH: http://patches.gluster.com/patch/4803 in master (rpc: add ref/unref for rpc clnt)
PATCH: http://patches.gluster.com/patch/4804 in master (cli, mgmt/glusterd: disallow probe to a cluster)