[Merge] ~dannf/ubuntu/+source/nova:lp1623871-x into ~ubuntu-server-dev/ubuntu/+source/nova:stable/mitaka

[Corey Bryant]

LGTM and thanks for the patch.  I tried getting the Power code into upstream stable/mitaka but it looks like it's not really a bug so not sure it'll get in.  Either way I'm going t update your patch to point to this review: https://review.openstack.org/#/c/388064/.
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https://code.launchpad.net/~dannf/ubuntu/+source/nova/+git/nova/+merge/307882
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