webadmin : Fix for StopRebalanceButton not disabled on rebalance complete.

Once rebalance is completed in all the nodes and the completed text gets

appended to the status at field, stop rebalance is disabled.

Fix for stop rebalance from status pop up not enabled.

Change-Id: I237be3005e064c3ed414f04f544909b115321594
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1020254
Signed-off-by: Anmol Babu <anbabu@redhat.com>