[Bug 232671] [gmirror] gmirror fails to recover from degraded mirror sets in some circumstances

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232671

--- Comment #1 from Conrad Meyer <cem at freebsd.org> ---
My proposed fix is, in g_mirror_update_device: don't transition from STARTING
to RUNNING unless we've got at least one ACTIVE mirror.  What is a gmirror
device going to do with zero active mirrors?  It seems useless.

Possible mitigations for similar classes of issue:

* When a stale mirror is detected at runtime *and* we've already got a complete
mirrorset (#6 above), zero out the gmirror superblock or otherwise disassociate
it from the logical mirrorset.  It's not going to get less stale if we ignore
it.

* In g_mirror_update_device when we're in RUNNING and notice we have no
mirrors, transition back to STARTING?  This sounds a little silly to me; we
should probably just avoid transitioning to RUNNING unless we have a valid
mirror.

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