[MacPorts] #14891: PATCH: use the fastest mirror in fetch phase

[MacPorts]

#14891: PATCH: use the fastest mirror in fetch phase
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  Reporter:  jmr at macports.org  |       Owner:  macports-tickets at lists.macosforge.org
      Type:  enhancement       |      Status:  new                                  
  Priority:  Normal            |   Milestone:  MacPorts base enhancements           
 Component:  base              |     Version:  1.7.0                                
Resolution:                    |    Keywords:                                       
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Comment (by jmr at macports.org):

 Updated: Recognise invalid hostnames like `image_magick.veidrodis.com`.
 (Sigh.) Check that the output from ping can be parsed as a number.
 Switched to using 3 ping packets and a 3-second timeout, since we
 effectively only have to wait for it once now that the pings run in
 parallel. Also simplified the code a bit.

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/14891#comment:7>
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