[Buildbot] #3213: Only send messages from Data API update methods

[Buildbot trac]

#3213: Only send messages from Data API update methods
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Reporter:  dustin       |       Owner:  dustin
    Type:  enhancement  |      Status:  assigned
Priority:  major        |   Milestone:  0.9.0
 Version:  master       |  Resolution:
Keywords:  mq           |
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Comment (by dustin):

 https://github.com/buildbot/buildbot/pull/1857

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Ticket URL: <http://trac.buildbot.net/ticket/3213#comment:2>
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