Added RabbitMQ to StoryBoard

In order to support subscriptions in StoryBoard, we're adding a
queueing system to support triggered events. The specification in
question is #95307, which goes into detail on the various different
options evaluated. I also anticipate that this system can be used
for report generation.

Change-Id: Ia4cc91f1e75365a9fb41ca163e55548023233412
Story: 96