[MacPorts] #47557: Add a variant for building & installing the RDM tests

[MacPorts]

#47557: Add a variant for building & installing the RDM tests
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 Reporter:  nomis52@…            |      Owner:  macports-tickets@…
     Type:  enhancement          |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.3
 Keywords:  haspatch maintainer  |       Port:  ola
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 This adds support for the RDM testing platform.

 Addresses: https://github.com/OpenLightingProject/ola/issues/719

 There doesn't seem to be a way of saying that the rdm_tests variant
 depends on OneOf(python26, python27), so I went with python27 .

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Ticket URL: <https://trac.macports.org/ticket/47557>
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