Two testing only changes, one to mock the notes helper during the
action_api testing so it doesn't wait for network timeouts silently and
take a very long time to run, and secondly enhanced testing around the
production of node filters used with deployment groups to validate that
rack_names are being handled in the desired way when producing node
filters for Drydock.
Change-Id: I5439e82333f40e91c270fa52c466731b4bbf1f2f
63a08c6a92