Upgrade or remove JAXB for Java 9+

[bjagg]

JAXB has been deprecated in Java 9 and completely removed in Java 11. Further, the Maven plugins for JAXB are not yet upgraded to work with Java 9+. This will be a blocker to our upgrade path to Java 11.

See https://www.jesperdj.com/2018/09/30/jaxb-on-java-9-10-11-and-beyond/