gluster:Hide skipped file count in remove brick status

  Skipped file count will be always zero in remove brick status
and it can be removed from remove-brick status dialog.

Change-Id: Iefaea9d3bfab34e405386e70f18277b488c10cc2
Bug-Url: https://bugzilla.redhat.com/1064712
Signed-off-by: Ramesh Nachimuthu <rnachimu@redhat.com>