libxfs: hoist listxattr from xfs_repair

Hoist the listxattr code from xfs_repair so that we can use it in
xfs_db.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Dave Chinner <dchinner@redhat.com>
5 files changed