MFC r235599:
Introduce new device flag G_MIRROR_DEVICE_FLAG_TASTING. It should
protect geom from destroying while it is tasting.
MFC r235600:
Prevent removing of the last active component from a mirror.
PR: kern/154860
Reviewed by: pjd
Tested by: Eugene Grosbein
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stable/8/sys/
stable/8/sys/geom/mirror/g_mirror.c