[MacPorts] #52441: Add dnsviz port

[MacPorts]

#52441: Add dnsviz port
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  Reporter:  casey@…     |      Owner:  macports-tickets@…
      Type:  submission  |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:
      Port:  dnsviz      |
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Comment (by ryandesign@…):

 Thanks. Some comments:

 * Ports for software hosted at GitHub should use the github 1.0 portgroup.
 * For ports that use the python portgroup but that provide apps, not
 python modules, specify only the single version of python that the port
 will use (or add variants to let the user choose which version of python
 they want, if that's important for this port).
 * A dependency on graphviz should be written in path: style so that
 graphviz-devel could satisfy it.
 * You shouldn't declare a dependency on stub ports, like ports whose names
 begin with "py-". Instead, depend on the specific python version of that
 module that you need. Use the `${python.version}` variable, as in
 `port:py${python.version}-dnspython`

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Ticket URL: <https://trac.macports.org/ticket/52441#comment:1>
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