[Buildbot] #2959: Old Builders not defined anymore in the config are still there

[Buildbot trac]

#2959: Old Builders not defined anymore in the config are still there
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Reporter:  Ben     |       Owner:
    Type:  defect  |      Status:  new
Priority:  major   |   Milestone:  0.9.+
 Version:  master  |  Resolution:
Keywords:          |
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Comment (by sa2ajj):

 FWIW, two last options look tje most appealing to me (cli & web ui
 options):

 * people do make mistakes -> give them a chance to see that something is
 wrong
 * in a multi-master setup it's more likely to make a mistake

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Ticket URL: <http://trac.buildbot.net/ticket/2959#comment:5>
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