[Buildbot] #3208: setupShellMixin throws exception about dictionary changed size for unknown argument

[Buildbot trac]

#3208: setupShellMixin throws exception about dictionary changed size for unknown
argument
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Reporter:  vlovich  |      Owner:
    Type:  defect   |     Status:  new
Priority:  major    |  Milestone:  undecided
 Version:  0.8.10   |   Keywords:
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 File "/Library/Python/2.7/site-packages/buildbot/process/buildstep.py",
 line 830, in setupShellMixin
     for arg in constructorArgs:
 exceptions.RuntimeError: dictionary changed size during iteration

 Clearly there should be an assert or the iteration should be occuring on
 the copy but modifying the original kwargs.

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Ticket URL: <http://trac.buildbot.net/ticket/3208>
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