fstests: remove xfs deprecated test

Remove xfs/018, xfs/081 and xfs/082 entirely, as they're deprecated
and obsolete for long time.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>
13 files changed