[pgjdbc/pgjdbc] 9b6506: test: drop OpenJ9 CI tests (#1196)

Branch: refs/heads/master
  Home:   https://github.com/pgjdbc/pgjdbc
  Commit: 9b6506dfa1076ad27a16de8fc3e85bc23f1a5b97
      https://github.com/pgjdbc/pgjdbc/commit/9b6506dfa1076ad27a16de8fc3e85bc23f1a5b97
  Author: Jorge Solorzano <jorsol@gmail.com>
  Date:   2018-05-21 (Mon, 21 May 2018)

  Changed paths:
    M .travis.yml
    R .travis/travis_install_openj9.sh

  Log Message:
  -----------
  test: drop OpenJ9 CI tests (#1196)

The AdoptOpenJDK project does not yet provide a stable build for JDK9+ using OpenJ9, the current production-ready build
isbased on OpenJDK8 and most Java implementations should pass the JCK, so it don't actually provide any benefit to test
withopenj9 since most installs are based on oraclejdk or openjdk, this will help to reduce the matrix complexity and
thetime it takes to run the tests.
 



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