Use Trusty environment for oracle jdk8
Use Trusty environment for oracle jdk8

Based on inputs from this thread:
https://travis-ci.community/t/install-of-oracle-jdk-8-failing/3038/8
krmahadevan/testng,krmahadevan/testng,krmahadevan/testng,krmahadevan/testng,krmahadevan/testng,cbeust/testng,cbeust/testng,cbeust/testng,cbeust/testng,cbeust/testng