Updated openstack/openstack
Project: openstack/nova  a548223e25330988064f1465eb52d721219ba1ea

Fix the uris in documentation

Broken image links when viewed from github:
https://github.com/openstack/nova/tree/master/doc/source/devref

Change-Id: Icad6ed2aa742310fbea399ddecd8480123eaac64