Disable OpenJDK 7 for now (server side issue)
Disable OpenJDK 7 for now (server side issue)

The build fails on OpenJDK 7 with a core dump. See:
https://github.com/travis-ci/travis-ci/issues/5227
https://github.com/travis-ci/travis-ci/issues/5669
jenkinsci/relution-plugin,mwaylabs/relution-jenkins-plugin,mwaylabs/relution-jenkins-plugin,mwaylabs/relution-jenkins-plugin