[Buildbot] #3499: buildbot upgrade-master does not display errors

[Buildbot trac]

#3499: buildbot upgrade-master does not display errors
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Reporter:  yetanotherion  |       Owner:  yetanotherion
    Type:  defect         |      Status:  new
Priority:  major          |   Milestone:  0.9.+
 Version:  master         |  Resolution:
Keywords:                 |
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Comment (by rutsky):

 Related pull requests:
 https://github.com/buildbot/buildbot/pull/2068,
 https://github.com/buildbot/buildbot/pull/2063

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Ticket URL: <http://trac.buildbot.net/ticket/3499#comment:1>
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