[MacPorts] #56434: Inconsistent flag names --nosync and --no-mirror

[MacPorts]

#56434: Inconsistent flag names --nosync and --no-mirror
-------------------------+----------------------------
  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:  MacPorts 2.5.0
 Component:  base        |    Version:  2.4.99
Resolution:              |   Keywords:
      Port:              |
-------------------------+----------------------------

Comment (by raimue):

 We also have `port install --no-rev-upgrade` and `port rdeps --no-build`.
 The version with hyphen seems to be preferred already, so we should change
 this to `port selfupdate --no-sync` and deprecate the old `--nosync` with
 a warning.

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Ticket URL: <https://trac.macports.org/ticket/56434#comment:2>
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