[Buildbot] #3621: Intermittent issues launching Docker latent workers as of 0.9.0b2

[Buildbot trac]

#3621: Intermittent issues launching Docker latent workers as of 0.9.0b2
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Reporter:  hexxeh   |      Owner:
    Type:  defect   |     Status:  new
Priority:  major    |  Milestone:  undecided
 Version:  0.9.0b2  |   Keywords:
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 Works as of 0.9.0b1, with 0.9.0b2 Docker volume specifications
 intermittently fail during the worker_prepare phase.

 Gist logs: https://gist.github.com/Hexxeh/6d7c4bc6ca7433536b9b5103d6a5c97f

 Relevant config chunk: volumes=["/cache:/cache:rw"]

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Ticket URL: <http://trac.buildbot.net/ticket/3621>
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