[Buildbot] #3329: slave protocol Listener class tries to set `self.master`

[Buildbot trac]

#3329: slave protocol Listener class tries to set `self.master`
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Reporter:  dustin    |       Owner:  dustin
    Type:  defect    |      Status:  assigned
Priority:  critical  |   Milestone:  0.9.0b2
 Version:  master    |  Resolution:
Keywords:            |
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Comment (by dustin):

 https://github.com/buildbot/buildbot/pull/1805

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Ticket URL: <http://trac.buildbot.net/ticket/3329#comment:6>
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