RFR (jdk13/java.xml) 8219692: DOM and SAX parser ignore namespace

[Joe Wang]

Please review an enhancement to the DOM and SAX factories. By default, 
DOM/SAX factories created using the existing newInstance methods do not 
support XML Namespace. Parsers instantiated with such factories would 
therefore ignore namespaces. Users not realizing or unaware of the 
legacy setting may run into the issue as demonstrated in the bug 
description.

This patch addresses the issue by introducing new methods that must set 
NamespaceAware to true. Factories instantiated using these methods can 
therefore create parsers that support XML Namespace by default.

JBS: https://bugs.openjdk.java.net/browse/JDK-8219692
webrevs: http://cr.openjdk.java.net/~joehw/jdk13/8219692/webrev/

Thanks,
Joe