[Buildbot] #3169: Latent Slaves are started serially.

[Buildbot trac]

#3169: Latent Slaves are started serially.
-----------------------+-----------------------
Reporter:  tom.prince  |      Owner:
    Type:  undecided   |     Status:  new
Priority:  major       |  Milestone:  undecided
 Version:  0.8.10      |   Keywords:
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 Because BuildRequestDistributor._activityLoop waits for
 self._maybeStartBuildsOnBuilder to finish with a lock held, only one slave
 can start at a time.

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Ticket URL: <http://trac.buildbot.net/ticket/3169>
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Buildbot: build/test automation