RFR 8037819: Xerces Update: jaxp/validation/XMLSchemaFactory

[huizhe wang]

Hi,

Please review update to XMLSchemaFactory along with changes to relevant 
classes. All new tests passed, as well as existing jaxp tests and JPRT.

Note that this updates XMLSchemaFactory, related classes such as 
XMLShemaValidator are only updated to the related revisions. Full update 
of XMLSchemaValidator and XMLSchemaLoader will be done separately.

http://cr.openjdk.java.net/~joehw/jdk9/8037819/webrev/

Thanks,
Joe