[Buildbot] #3518: Add support for worker pools

[Buildbot trac]

#3518: Add support for worker pools
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Reporter:  thalin              |       Owner:
    Type:  undecided           |      Status:  new
Priority:  minor               |   Milestone:  undecided
 Version:  master              |  Resolution:
Keywords:  master-slave slave  |
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Comment (by tardyp):

 I like the feature.

 It has interesting consequences in the core though. Needs to make the list
 of workers dynamic, or probably simpler, reconfigure automatically the
 worker-manager with an autoscaling algorithm.

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Ticket URL: <http://trac.buildbot.net/ticket/3518#comment:1>
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