[MacPorts] #63613: port install: fetch shouldn't abort the whole command on a 503 error

[MacPorts]

#63613: port install: fetch shouldn't abort the whole command on a 503 error
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  Reporter:  greyhare     |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.7.1
Resolution:               |   Keywords:
      Port:               |
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Comment (by greyhare):

 Whatever was going on server side is cleared now. (Maybe I caught it
 recomputing checksums? Or checksum files aren't really there, but are
 computed, cached, and served by a script, which broke? Or it was a
 temporary misconfiguration?) But it was occurring for a number of packages
 I was trying to upgrade with `sudo port upgrade outdated`.

 In any case, maybe have *any* fetch error bail out to the next download
 site?

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Ticket URL: <https://trac.macports.org/ticket/63613#comment:2>
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