[Buildbot] #3336: DockerLatentBuildSlave doesn't get properly reconfigured

[Buildbot trac]

#3336: DockerLatentBuildSlave doesn't get properly reconfigured
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Reporter:  Ben        |      Owner:
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  0.9.0
 Version:  0.9.0b2    |   Keywords:
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 I had modified the dockerfile parameter, and the log was still showing the
 execution of a very old version of that file.

 Note: the content of the file is given as string to the constructor.

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Ticket URL: <http://trac.buildbot.net/ticket/3336>
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