webadmin: show remove brick status on stop remove birck

 Showing the status of  data migartion  after stoping the remove brick
operation.

Change-Id: Ic29a668ac56d3a5fbab0a3bb553dfe511d5902f4
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1024227
Signed-off-by: Ramesh Nachimuthu <rnachimu@redhat.com>