[MacPorts] #53006: buildbot @0.8.12_7: update to 0.9.1

[MacPorts]

#53006: buildbot @0.8.12_7: update to 0.9.1
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  Reporter:  l2dy      |      Owner:  ryandesign
      Type:  update    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  buildbot  |
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Comment (by ryandesign):

 Absolutely, because MacPorts infrastructure is using the buildbot 0.8
 ports and has no desire to upgrade to 0.9, we need to keep buildbot 0.8
 ports in MacPorts. We can also have ports for buildbot 0.9.

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Ticket URL: <https://trac.macports.org/ticket/53006#comment:3>
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