Glusterd/Rebalance: Update rebalance status properly in
                    node_state.info

credit: kaushal@redhat.com
        spalai@redhat.com

Change-Id: I08d0771e2168a4a6ebd473e8a937b8b2eda1341a
BUG: 1075087
Signed-off-by: Susant Palai <spalai@redhat.com>
Reviewed-on: http://review.gluster.org/7214
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Kaushal M <kaushal@redhat.com>