Fix for Bug NMS-6830

Can't monitor JBoss EAP 6.1.0 or later with the JMXMonitor/JMXCollector
(using Jsr160Collector)
NMS-6835 do not attempt to load external DTDs

Conflicts:
	core/xml/src/main/java/org/opennms/core/xml/JaxbUtils.java
Merge remote-tracking branch 'origin/1.12'

Conflicts:
	core/xml/src/main/java/org/opennms/core/xml/JaxbUtils.java