[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 verm):

 I have been working on this for the past week off and on.  I have
 something working now.  I need to write tests.  It should work without
 changing any of the current hooks.

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Ticket URL: <http://trac.buildbot.net/ticket/3211#comment:2>
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