xfs_repair: check and repair quota metadata

xfs_repair: check and repair quota metadata

Today, quota inodes are not checked at all in xfs_repair.  (This is
a little odd, because xfs_check used to do it in process_quota()).

The kernel has quota inode validation and repair routines, but it is
out of the ordinary for the kernel to be doing metadata repair.  And
now that we have metadata verifiers, this also yields a surprisingly
noisy mount if quota inodes are corrupted, even immediately after an
xfs_repair.

So this patch allows xfs_repair to fix the quota inode metadata.

Quotacheck is still left for the kernel.  After a few more releases,
I'll propose removing the repair calls from quotacheck.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>