[MacPorts] #60614: Travis: Create hosts file to work around DNS resolution failures

[MacPorts]

#60614: Travis: Create hosts file to work around DNS resolution failures
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  Reporter:  ryandesign      |      Owner:  admin@…
      Type:  defect          |     Status:  closed
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:  fixed           |   Keywords:
      Port:                  |
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Comment (by ryandesign):

 I've asked about it now here: https://travis-ci.community/t/intermittent-
 network-outages-on-macos-builders/9208

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Ticket URL: <https://trac.macports.org/ticket/60614#comment:4>
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