9628d2a094
This was originaly copied over from "compute-manage-volumes.rst" doc in the openstack-manuals repo but it's clearly mostly talking about managing volumes on the Cinder side, not how they related to compute server instances. Furthermore, Cinder already has a much more detailed CLI guide on managing volumes, so this change removes the content that's not specific to Nova and just links to the Cinder docs. Change-Id: I8e1c0d30debfdd4017c6d1a810a7b7dd382cd02d