Updated openstack/openstack
Project: openstack/nova  4821d79e406cb17d974c47b82bede4ae103bb5ed

devref policy: code is canonical source of truth for API

Although many reviewers know that documentation isn't the source of
truth for API behavior, we have never written this policy down before.

Change-Id: Ibe7b355947200b668324028972c121e5357a0470