[MacPorts] #43934: py-stevedore @0.8_1: update to @0.15 and enable py34 subport

[MacPorts]

#43934: py-stevedore @0.8_1: update to @0.15 and enable py34 subport
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  Reporter:  Peter.Danecek@…  |      Owner:  macports-tickets@…
      Type:  update           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:
      Port:  py-stevedore     |
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Comment (by mister.jannick@…):

 I’ve uploaded a proposed update. They moved from github to openstack with
 the source so I removed the GitHub port group.

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Ticket URL: <https://trac.macports.org/ticket/43934#comment:1>
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