[Buildbot] #3661: lock upstream dependencies and use service like pyup.io to update them

[Buildbot trac]

#3661: lock upstream dependencies and use service like pyup.io to update them
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Reporter:  rutsky       |       Owner:
    Type:  enhancement  |      Status:  new
Priority:  major        |   Milestone:  undecided
 Version:               |  Resolution:
Keywords:               |
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Comment (by rutsky):

 @tomprince mentioned service for tracking dependencies:
 https://requires.io/

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Ticket URL: <http://trac.buildbot.net/ticket/3661#comment:3>
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