Re-add openjdk-r ppa for access to openjdk-8-*
Re-add openjdk-r ppa for access to openjdk-8-*

ljharb/travis-cookbooks,ljharb/travis-cookbooks,spurti-chopra/travis-cookbooks,travis-ci/travis-cookbooks,travis-ci/travis-cookbooks,spurti-chopra/travis-cookbooks,travis-ci/travis-cookbooks,spurti-chopra/travis-cookbooks,ljharb/travis-cookbooks