[MacPorts] #49808: update buildbot to 0.8.12

[MacPorts]

#49808: update buildbot to 0.8.12
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  Reporter:  ryandesign@…    |      Owner:  admin@…
      Type:  enhancement     |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by jmr@…):

 This isn't entirely straightforward, since we subclass in a couple places
 in our config. MailNotifier in particular has changed with previous
 updates.

 Other incompatibilities relevant to us are:
  * [http://docs.buildbot.net/current/relnotes/0.8.7.html 0.8.7] baseURL
 has been removed in SVN to use just repourl. Branch info should be
 provided with Interpolate.
  * [http://docs.buildbot.net/current/relnotes/0.8.8.html 0.8.8] The
 workdir build property has been renamed to builddir.
  * [http://docs.buildbot.net/current/relnotes/0.8.9.html 0.8.9]
   * The slave-side source steps are deprecated in this version of
 Buildbot, and master-side support will be removed in a future version.
 Please convert any use of slave-side steps (imported directly from
 buildbot.steps.source, rather than from a specific module like
 buildbot.steps.source.svn) to use master-side steps.
   * slavePortnum option deprecated, please use
 `c['protocols']['pb']['port']` to set up PB port
   * Upgrade your steps to [http://docs.buildbot.net/current/manual/new-
 style-steps.html new-style] now, as support for old-style steps will be
 dropped after Buildbot-0.9.0.

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Ticket URL: <https://trac.macports.org/ticket/49808#comment:1>
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