glusterd: Indexed node information in dict to retain consistency.

Problem:
--------
Depending on the response time from different nodes, the response
dict for rebalance status was populated in  a FIFO manner, and
hence the output for the CLI was never consistent.

Fix:
----
Irrespective of the response time of the nodes, we now index the
entries in the response dict for rebalance status, in reference
to the peerlist. So, the order of the entries and hence the CLI
output is always consistent.

Change-Id: Ica7e89e5d95aa9860a6f3c7eff58ca2052e05bd6
BUG: 888390
Signed-off-by: Avra Sengupta <asengupt@redhat.com>
Reviewed-on: http://review.gluster.org/4416
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>