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

[Buildbot trac]

#3169: Latent Slaves are started serially.
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Reporter:  tom.prince  |       Owner:
    Type:  defect      |      Status:  new
Priority:  major       |   Milestone:  0.9.+
 Version:  0.8.10      |  Resolution:
Keywords:  latent      |
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Comment (by copumpkin):

 For anyone watching this, there's an open PR attempting to address this at
 https://github.com/buildbot/buildbot/pull/2072

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Ticket URL: <http://trac.buildbot.net/ticket/3169#comment:5>
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