xfstests: add filter to 200 accommodate changed mount output

xfstests: add filter to 200 accommodate changed mount output

The mount binary changed its output w.r.t. red-only devices, and
stopped referring to a "block device."

This broke at least test xfs/200; add a common filter to remove
the "block device" from older mount binary output, and change
the 200.out file to match.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Rich Johnston <rjohnston@sgi.com>