This addresses a Nova config deprecation in the Mitaka release
documented here: http://docs.openstack.org/releasenotes/nova/mitaka.html#deprecation-notes
Adding nova_glance_api_servers to the nova_all group vars to address
a nova role namespacing issue as well.
Needed-By: If33d3ce9e9dfee827a92c9c0813b7c0a18cb8a7b
Change-Id: Ibc0a5b70d4da2e905b10b4c1334b57a6f0f3b4ed
Closes-Bug: #1596084