PATCH: teach (gpt)zfsboot to discern vdev status correctly

[Matt Reimer]

Instead of assuming all vdevs are healthy, check the newest vdev label
for each vdev's status. Booting from a degraded vdev should now be
more robust.

Sponsored by: VPOP Technologies, Inc.

Matt Reimer

(Note that much of this patch is merely whitespace change due to a
block needing to be reindented.)
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