The boot loader should look in the standard places for the UFS
superblock, but not go too far into the speculative realm. Supress
errors about hash being invalid, which will allow us to boot, even when
the superblock looks good, but fails the hash test. This defers any
policy decisions about booting and/or recovery to userland. As a side
effect, we no longer spam the console with a lot of useless messages
about not being able to find UFS superblocks on devices that do not
contain a UFS filesystem.
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