c2161091ad
When importing a pool, don't assume that the passed pool configuration
at vdev_load is always vaild. It's possible that a stale configuration
that comes with extra vdevs, where metaslab_init() would fail because
of lower layer returns error.
Change the code to make metaslab_init() handle and return errors from
lower layer and pass it back to upper layer and handle it there.
Illumos issue:
5213 panic in metaslab_init due to space_map_open returning ENXIO
MFC after: 2 weeks
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