gluster: Update task status everytime while querying

Modified to update the task status in engine DB everytime a remove
bricks status query is fired. This makes sure the details in the DB are
up-to-date with query status.
This makes sure correct working of Retain and Commit actions on the
remobe bricks for volume.

Change-Id: I3e8fa7ab590e15ee5821ae2f3fb41650c195c0fa
Bug-Url: https://bugzilla.redhat.com/1024782
Signed-off-by: Shubhendu Tripathi <shtripat@redhat.com>