[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(at)gmail(dot)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 is based on OpenJDK8 and most Java implementations should pass the JCK, so it don't actually provide any benefit to test with openj9 since most installs are based on oraclejdk or openjdk, this will help to reduce the matrix complexity and the time it takes to run the tests.

**NOTE:** This service been marked for deprecation: https://developer.github.com/changes/2018-04-25-github-services-deprecation/

Functionality will be removed from GitHub.com on January 31st, 2019.