Updated openstack/openstack
Project: openstack/nova  995a7e5e5c85434dc5357d89870bbf5616784d57

Add a reference to the nova developer documentation

I've showed these docs to more people than I care to. It would be
extremely helpful to reference them in HACKING, which is generally
the first thing people read if they intend to hack.

Change-Id: I9194d98f5525e29711b4a1b26414a50b8ceba525