[MacPorts] #68600: Make john use only Python 3 dependencies by default

[MacPorts]

#68600: Make john use only Python 3 dependencies by default
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  Reporter:  tux-o-matic  |      Owner:  catap
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  python2 python3 py-pysap
      Port:  john         |
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Comment (by tux-o-matic):

 I got something working locally so I should be able to come up with a PR.

 I was ok with the few occasional Python 2.7 dependencies but since some of
 them started to force/break in Python 2.7 in their migration process to
 3.x, some Ports such as john-jumbo started to break.

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Ticket URL: <https://trac.macports.org/ticket/68600#comment:8>
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