[MacPorts] #56017: Buildbot: Replace WithProperties with Interpolate

[MacPorts]

#56017: Buildbot: Replace WithProperties with Interpolate
---------------------------+---------------------
 Reporter:  ryandesign     |      Owner:  admin@…
     Type:  enhancement    |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  buildbot/mpbb  |    Version:
 Keywords:                 |       Port:
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 Our buildbot master.cfg uses `WithProperties` in many places. According to
 the [http://docs.buildbot.net/0.8.12/manual/cfg-properties.html#id7
 buildbot documentation], `WithProperties` is deprecated and should be
 replaced with `Interpolate` ([http://docs.buildbot.net/0.8.12/manual/cfg-
 properties.html#interpolate documentation]). The interface is different
 though so it's not just a simple find-replace.

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Ticket URL: <https://trac.macports.org/ticket/56017>
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