[Buildbot] #3572: Restore logHorizon and buildHorizon functionality

[Buildbot trac]

#3572: Restore logHorizon and buildHorizon functionality
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Reporter:  tardyp       |       Owner:
    Type:  enhancement  |      Status:  new
Priority:  major        |   Milestone:  0.9.5
 Version:  master       |  Resolution:
Keywords:               |
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Comment (by tardyp):

 https://github.com/buildbot/buildbot/issues/3141

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Ticket URL: <http://trac.buildbot.net/ticket/3572#comment:5>
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