[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:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by l2dy):

 Replying to [ticket:60614 ryandesign]:
 > To test the theory that this is merely a DNS problem, do we have the
 ability to modify /etc/hosts on the Travis build machines? If so, we could
 have _ci/bootstrap.sh at least add entries for packages.macports.org,
 packages-private.macports.org and distfiles.macports.org. That might help
 some builds succeed that would otherwise have failed.

 Probably yes, we have root access to the VM.

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Ticket URL: <https://trac.macports.org/ticket/60614#comment:1>
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