Switch nightly build to JDK11 (#1761)
Switch nightly build to JDK11 (#1761)

Signed-off-by: Alberto Morales Perez <133e9513607f11e26df8656fd663fd13caca9864@redhat.com>
drdaveg/droolsjbpm-build-bootstrap,drdaveg/droolsjbpm-build-bootstrap