xfs: handle zoned file systems in _scratch_xfs_force_no_metadir

xfs: handle zoned file systems in _scratch_xfs_force_no_metadir

Zoned file systems required the metadir feature.  If the tests are run
on a conventional block device as the RT device, we can simply remove
the zoned flag an run the test, but if the file systems sits on a zoned
block device there is no way to run a test that wants a non-metadir
file system.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Zorro Lang <zlang@kernel.org>