
This is necessary if using nova-compute with RBD backend (directly, not via Cinder) and wishing to make an instance image to Glance while (1) following the recommended Ceph permissions which do not give Nova write permissions to the images' pool or (2) not using RBD with Glance or (3) not revealing what Glance actually uses as the backend (hiding locations). Change-Id: I88e1e0ca01b2b2effad9515b905cc761fbb5d2d4