[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 tardyp):

 last time we looked, the dependency managment service was not supporting
 several package per git tree.

 We need that, and also we need to have the optional requirement supported

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Ticket URL: <http://trac.buildbot.net/ticket/3661#comment:1>
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