Fix Travis JDK8 installation failure #368
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It seems that Travis no longer install
oraclejdk8(then build fails) so let's useopenjdk8.As of 2019-04-15,
xenialis now default and recommended on Travis, so let's move on instead of stayingtrusty.This PR explicitly specifies
xenial, so it won't be updated to latest silently and break builds in future.And
sudo: falseis no longer be available so let's drop it.