common/config: remove default 4k blocksize from XFS_MKFS_OPTIONS
xfstests set "-bsize=4k" to XFS_MKFS_OPTIONS by default, then give
it to MKFS_OPTIOPNS. So MKFS_OPTIOPNS always contains "-bsize=4k"
except we set XFS_MKFS_OPTIONS manually.
It's useless to set XFS_MKFS_OPTIONS to "-bsize=4096" by default,
especially that will cause all cases with _scratch_mkfs_blocksized()
always fail as "-b size option respecified", when test on XFS. For
exmaple: generic/222
Signed-off-by: Zorro Lang <zlang@redhat.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>