travis-ci: Update to JDK 9 for xenial compat
travis-ci: Update to JDK 9 for xenial compat

gasinger/sagetv,jusjoken/sagetv,JREkiwi/sagetv,google/sagetv,google/sagetv,google/sagetv,BartokW/sagetv,gasinger/sagetv,JREkiwi/sagetv,JREkiwi/sagetv,BartokW/sagetv,BartokW/sagetv,jusjoken/sagetv,gasinger/sagetv,gasinger/sagetv,BartokW/sagetv,jusjoken/sagetv,google/sagetv,jusjoken/sagetv,JREkiwi/sagetv