xfs: test setting XFS BMBT fields in xfs_db

xfs: test setting XFS BMBT fields in xfs_db

Test the setting of the XFS BMBT fields via xfs_db. Runs through the
valid bit values for each field and tests an illegal value.

[dchinner: added _require_xfs_mkfs_crc and turned off crcs so that
the test doesn't just fail on CRC enabled test runs.]

[dchinner: added hex block values to check they don't get endian
swapped.]

Signed-off-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>