[Buildbot] #3299: Passing a renderable to workdir no longer works

[Buildbot trac]

#3299: Passing a renderable to workdir no longer works
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Reporter:  vlovich  |       Owner:
    Type:  defect   |      Status:  new
Priority:  blocker  |   Milestone:  undecided
 Version:  master   |  Resolution:
Keywords:           |
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Comment (by vlovich):

 adding 'workdir' to renderables fixes the problem but I'm not sure why.
 Haven't been able to write a unit test to find said bug though.

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Ticket URL: <http://trac.buildbot.net/ticket/3299#comment:1>
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