[Buildbot] #2928: SetPropertyFromCommand shouldn't use stderr

[Buildbot trac]

#2928: SetPropertyFromCommand shouldn't use stderr
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Reporter:  vlovich  |      Owner:
    Type:  defect   |     Status:  new
Priority:  major    |  Milestone:  undecided
 Version:  0.8.9    |   Keywords:
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 Having SetPropertyFromCommand include stderr in the property that is set
 feels like an inflexible default.  I think a better approach is to add two
 new keywords:

 includeStdout=True & includeStderr=False.

 That way those that need it have a way to trivially include it while the
 default is likely the default behaviour expected.

 At the very least, the current behaviour needs to be documented.

 Saw this on 0.8.8 but I'm assuming this is unchanged in 0.8.9 nor master
 since I haven't seen anything in the changelog.

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Ticket URL: <http://trac.buildbot.net/ticket/2928>
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