[Buildbot] #3081: buildbot.test.integration.test_try_client is flaky

[Buildbot trac]

#3081: buildbot.test.integration.test_try_client is flaky
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Reporter:  Ben     |       Owner:  dustin
    Type:  defect  |      Status:  assigned
Priority:  major   |   Milestone:  0.9.0
 Version:  master  |  Resolution:
Keywords:          |
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Comment (by dustin):

 Note that `Dispatcher.stopService` was never called.  The Dispatcher class
 actually ignores `startService` and just starts things in its constructor
 -- whether it's running or not.  So when we attach a Dispatcher as a child
 of an already-stopped PBManager, the Dispatcher starts up a listening
 port, but it isn't running (and thus does not get its `stopService` method
 called).

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Ticket URL: <http://trac.buildbot.net/ticket/3081#comment:17>
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