[CFR][ZFS] merge Illumos rev. 13379 (writing to imbalanced vdevs)

[Martin Matuska]

zfs tries to allocate blocks evenly across all devices. This means when
devices are imbalanced zfs will lots of CPU searching for space on devices
which tend to be pretty full.

https://www.illumos.org/issues/1051
https://www.illumos.org/projects/illumos-gate/repository/revisions/13379

If there are no objections, I will commit this to -HEAD

-- 
Martin Matuska
FreeBSD committer
http://blog.vx.sk

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