Update to trusty image and virtual GCE build environment with openjdk 8
+dist: trusty
+sudo: required
language: java
jdk:
- oraclejdk8
+- openjdk8
before_install:
- openssl aes-256-cbc -K $encrypted_d472159ded8f_key -iv $encrypted_d472159ded8f_iv
-in .travis/keyrings/deploy_key.pem.enc -out .travis/keyrings/deploy_key.pem -d
