[MacPorts] #52873: port sync should open only a single rsync connection

[MacPorts]

#52873: port sync should open only a single rsync connection
------------------------+--------------------------------
 Reporter:  ryandesign  |      Owner:  macports-tickets@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  base        |    Version:  2.3.4
 Keywords:              |       Port:
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 In src/macports1.0/macports.tcl, MacPorts currently opens a second
 connection to the rsync server to download the platform-specific
 PortIndex, and a third connection to download PortIndex.rmd160. Besides
 being slower and using more network bandwidth and server resources, this
 presents an opportunity for the user to get a mismatched set of files --
 for example, an old PortIndex and a new PortIndex.rmd160 that does not
 match it.

 MacPorts should open one and only one connection to the rsync server when
 instructed via `sudo port sync` so to do.

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Ticket URL: <https://trac.macports.org/ticket/52873>
MacPorts <https://www.macports.org/>
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