gluster: update task details in stop remove brick

  Gluster async task details like files moved, scanned, failed are
not getting updated as part of task description when user tries stop
or commit the operartion. This patch helps to update the task
description correctly.

  It makes use of the task status returned as part of stop operation
from gluster.

Bug-Url: https://bugzilla.redhat.com/1061813

Change-Id: I90be6a98470f0cb72bc7508f2cb2364f77e02077
Signed-off-by: Ramesh Nachimuthu <rnachimu@redhat.com>