RFR(JDK 13/java.xml) 8206132: DOM parser does not honor DocumentBuilderFactory.setExpandEntityReferences(false)

[Joe Wang]

Please review a change to the DOM parser so that it complies with the 
specification with regard to the ExpandEntityReferences feature. This 
change  corrects the behavior so that the resulting DOM tree includes 
EntityReference nodes but not the expanded Text nodes when the feature 
is off. It also means that the DOM parser will not attempt to read 
entity references if any.

JBS: https://bugs.openjdk.java.net/browse/JDK-8206132
webrevs: http://cr.openjdk.java.net/~joehw/jdk13/8206132/webrev/
Thanks,
Joe