[MacPorts] #57720: preferred_hosts has no effect on archive_site_local

[MacPorts]

#57720: preferred_hosts  has no effect on archive_site_local
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  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:  MacPorts 2.6.0
 Component:  base        |    Version:  2.5.99
Resolution:              |   Keywords:
      Port:              |
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Comment (by ryandesign):

 I can understand that point of view. However, what we need for Travis CI
 and our Buildbot setup is to be able to communicate to MacPorts that we
 want one URL checked first, a different URL checked second, and no other
 URLs checked. `archive_site_local` seemed like a way to do that, but it's
 becoming frustrating when the behavior is not defined/documented anywhere
 and seems to change at random when I move to a different computer for
 example.

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Ticket URL: <https://trac.macports.org/ticket/57720#comment:3>
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