[MacPorts] #54056: MacPorts should warn when not using "macports" rsync module

[MacPorts]

#54056: MacPorts should warn when not using "macports" rsync module
-------------------------+-----------------------------
  Reporter:  ryandesign  |      Owner:  jmroot
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:  MacPorts 2.10.0
 Component:  base        |    Version:  2.4.1
Resolution:  fixed       |   Keywords:
      Port:              |
-------------------------+-----------------------------

Comment (by jmroot):

 `man sources.conf` (or equivalently `port help sources.conf`) has the full
 answer in the Files section. For users who haven't customised anything, it
 will be `/opt/local/etc/macports/sources.conf`. It would probably be
 possible to print the full path in these warnings to help avoid confusion.

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Ticket URL: <https://trac.macports.org/ticket/54056#comment:5>
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