RFR: 8163232: CatalogResolver to extend XMLResolver and LSResourceResolver

[Joe Wang]

Hi,

Please review a consolidation of resolver support to CatalogResolver. 
The purpose is to simplify the interface and usage scenarios so that the 
one CatalogResolver is usable for all JDK XML processors. As with the 
existing resolver interfaces, the change makes it no distinction between 
system identifiers and URIs, which would make it easier for users to 
create catalogs (without worrying about when and why to use what type of 
catalog entries). The implementation is almost identical for all JDK XML 
resolver interfaces.

New tests: added to CatalogTest.java to cover URIResolver (Transform), 
XMLResolver (StAX) and LSResourceResolver (Validation).
                  new CatalogSupport5.java is added to cover error 
handling. When there is no match found, a processor shall return with 
the specified checked exception rather than CatalogException.

Existing tests: mainly replaced CatalogUriResolver with CatalogResolver.

JBS: https://bugs.openjdk.java.net/browse/JDK-8163232
webrevs: http://cr.openjdk.java.net/~joehw/jdk9/8163232/webrev/

Thanks,
Joe