Updated openstack/openstack
Project: openstack/nova  7b56159359bd6c53e6d03b0d6492b80d79841839

Update devref with link to kilo priorities

Devref contains a document discussing project priorities.  Include a
link to the list of specific Kilo priorities that lives over in the
nova-specs repo.

Change-Id: I1770447b03df1cc1ab029780fada96fab8ccaa0f