[Buildbot] #3211: forward-port change hooks to nine

[Buildbot trac]

#3211: forward-port change hooks to nine
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Reporter:  dustin       |       Owner:
    Type:  enhancement  |      Status:  new
Priority:  major        |   Milestone:  0.9.+
 Version:  master       |  Resolution:
Keywords:  hook         |
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Comment (by sa2ajj):

 Unless somebody else manages to start working on this earlier, I'd like to
 do the implementation (to better understand how new web backend works).

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Ticket URL: <http://trac.buildbot.net/ticket/3211#comment:1>
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