xfs_logprint: print all AGI unlinked buckets

xfs_logprint: print all AGI unlinked buckets

When printing buffer contents, the AGI unlinked buckets are not
printed in transactional output. In normal dump format, they are
printed, but that format is generally not useful for log recovery
analysis. Add the same code to the transactional buffer dump.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Rich Johnston <rjohnston@sgi.com>