RFR (JAXP) 8056202: Xerces Update: Catalog Resolver

[huizhe wang]

Hi,

This is an update to Xerces' Catalog Resolver implementation. The 
changes were mostly performance related, for example the changes to the 
normalizeURI method in Catalog.java to avoid creating new Strings if the 
input is already in normalized form.

Bug: https://bugs.openjdk.java.net/browse/JDK-8056202
Webrev: http://cr.openjdk.java.net/~joehw/jdk9/8056202/webrev/

Thanks,
Joe