build against openjdk 8 - 14
build against openjdk 8 - 14

Since Travis CI runs on Ubuntu Xenial, oraclejdk8 isn't available anymore.

Signed-off-by: Manfred Hanke <0654fac8ffe4cb1bd25b5e513b73e1f5e9eb1efa@tngtech.com>

TNG/config-builder