[Buildbot] #2819: Triggerable shutdown is broken

[Buildbot trac]

#2819: Triggerable shutdown is broken
-------------------+--------------------
Reporter:  dustin  |      Owner:  dustin
    Type:  defect  |     Status:  new
Priority:  major   |  Milestone:  0.9.0
 Version:          |   Keywords:
-------------------+--------------------
 {{{
           File
 "/home/dustin/code/buildbot/t/buildbot/master/buildbot/schedulers/triggerable.py",
 line 76, in stopService
             yield self._updateWaiters.stop()
         exceptions.AttributeError: 'function' object has no attribute
 'stop'
 }}}

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Ticket URL: <http://trac.buildbot.net/ticket/2819>
Buildbot <http://buildbot.net/>
Buildbot: build/test automation