[MacPorts] #57698: Travis: Use the normal MacPorts installer

[MacPorts]

#57698: Travis: Use the normal MacPorts installer
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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 [comment:4 ryandesign]:
 > Oops, I didn't see that there, and I didn't realize that just doing that
 would automatically build and upload the new version to a place Travis
 could use it. Still, if that step weren't necessary, it would be simpler.

 We can merge the Travis configurations (in a new commit, not git-merge),
 but I'd suggest creating a new bintray account for uploading (currently
 using `l2dybot`). Travis CI supports deploying tags only: https://docs
 .travis-ci.com/user/deployment/#conditional-releases-with-on.

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Ticket URL: <https://trac.macports.org/ticket/57698#comment:6>
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