xfstests: a couple of fixes for external logs

xfstests: a couple of fixes for external logs

Fix a couple of issues when running xfsqa with external logs:

 - update the 096 golden output for the external log case
 - add a new _scratch_xfs_check similar to _scratch_xfs_logprint and
   _scratch_xfs_repair that take the log device into account and use it
   in test 134
 - use _scratch_xfs_repair in test 202 to fix it for external log
   devices

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Eric Sandeen <sandeen@sandeen.net>