[Buildbot] #3355: Create a nine migration guide

[Buildbot trac]

#3355: Create a nine migration guide
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Reporter:  dustin       |       Owner:  dustin
    Type:  enhancement  |      Status:  new
Priority:  critical     |   Milestone:  0.9.0
 Version:               |  Resolution:
Keywords:  docs         |
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Comment (by dustin):

 see also #3313

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Ticket URL: <http://trac.buildbot.net/ticket/3355#comment:2>
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