Update nova-core
Update nova-core

Change-Id: I16bb8716580d39adfb36b4fd91993ea24522b375
Reviewed-on: https://review.openstack.org/36095
Approved: Russell Bryant <b61ba72562ef1f6718e4f653428a87ed07b576b8@redhat.com>
Reviewed-by: Russell Bryant <b61ba72562ef1f6718e4f653428a87ed07b576b8@redhat.com>
Tested-by: Jenkins

openstack-infra/reviewstats,JohnGarbutt/reviewstats,cp16net/reviewstats,openstack-infra/reviewstats,cp16net/reviewstats,JohnGarbutt/reviewstats