revert the new superblock format. it violates the rule that new

kernels and old tools are safe.
i'm leaving in the "updated" flag, so that fsck will continue to remove
it from filesystems.  the kernel no longer attempts to upgrade
superblocks and will use the old format.
post-mortem discussions have concluded that maybe jamming ffs2 fields
into random locations in the superblock is asking for trouble, and we
need to talk about this some more.  my bad for not thinking fast enough.

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