xfs/155: fail the test if xfs_repair hangs for too long

xfs/155: fail the test if xfs_repair hangs for too long

There are a few hard to reproduce bugs in xfs_repair where it can
deadlock trying to lock a buffer that it already owns.  These stalls
cause fstests never to finish, which is annoying!  To fix this, set up
the xfs_repair run to abort after 10 minutes, which will affect the
golden output and capture a core file.

This doesn't fix xfs_repair, obviously.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Zorro Lang <zlang@kernel.org>