xfs_db: update field printing for dir crc format changes.

xfs_db: update field printing for dir crc format changes.

Note that this also requires changing the type parsing to only
allow dir3 data block parsing on CRC enabled filesystems. This is
slighly more complex than it needs to be  because of the way the
type table is walked and the assumption that all the entries are in
type number order.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>