Since the new 'exchange range' functionality is no longer a VFS level
concept, the xfs_io swapext -v options have changed. Update fstests to
reflect this new reality.
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Zorro Lang <zlang@kernel.org>