[Buildbot] #3203: Support control messages via MQ

[Buildbot trac]

#3203: Support control messages via MQ
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Reporter:  dustin       |      Owner:
    Type:  enhancement  |     Status:  new
Priority:  critical     |  Milestone:  0.9.0
 Version:  master       |   Keywords:  mq
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 For #1039 (triggerable) and #3202 (force), we need a way to communicate
 back and forth between the frontend web UI and backend schedulers (and
 other components).

 This might be some kind of IPC over MQ.

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Ticket URL: <http://trac.buildbot.net/ticket/3203>
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