[MacPorts] #56642: python-1.0: set default master_sites and distname

[MacPorts]

#56642: python-1.0: set default master_sites and distname
-------------------------+--------------------
 Reporter:  yan12125     |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:
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 A common pattern in Python ports is:


 {{{
 master_sites        pypi:[string index ${python.rootname}
 0]/${python.rootname}
 distname            ${python.rootname}-${version}
 }}}

 It would be great to set the two values in python-1.0.tcl, so that
 Portfiles can be simplified.

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Ticket URL: <https://trac.macports.org/ticket/56642>
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