[Buildbot] #3583: Worker should properly finish their current build when disconfigured

[Buildbot trac]

#3583: Worker should properly finish their current build when disconfigured
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Reporter:  tardyp       |      Owner:
    Type:  enhancement  |     Status:  new
Priority:  major        |  Milestone:  0.9.+
 Version:  master       |   Keywords:
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 When workers are disconfigured the stopService is just detaching them
 loosing all the great work that they were doing so far.

 We should have a better lifecycle for those use cases.

 for example a reconfiguration that remove some workers should allow that
 the build finish properly.

 Master stop should also first stop the builds and wait that the workers
 are finished before stopping.

 Such stopped builds should be put as RETRY (as if the worker is
 disconnected), unless they are a triggered build

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Ticket URL: <http://trac.buildbot.net/ticket/3583>
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Buildbot: build/test automation