[FLINK-12516][travis] use Ubuntu 16.04 LTS (Xenial) and change to openJDK8 #8448
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What is the purpose of the change
This changes the test environment from trusty to xenial which is still
supported until 2021-04 and provides more up-to-date system libraries.
Since oraclejdk8 is not available in Travis' xenial image and we can't switch
to oraclejdk9 yet, this also changes the JDK to openJDK8.
Brief change log
xenial
openjdk8
Verifying this change
Run Travis tests.
Does this pull request potentially affect one of the following parts:
@Public(Evolving)
: noDocumentation