[NCL-4676] Revert to use OpenJDK 1.8
[NCL-4676] Revert to use OpenJDK 1.8

This is done to workaround a bug found in EAP 7.2.3 with JDK 11
(https://issues.jboss.org/browse/WFCORE-4674)

project-ncl/causeway,project-ncl/causeway