RFR (JAXP) - JDK-8077931: Develop tests for XML Catalog API

[John Jiang]

Hi all,
Please help review the tests for XML Catalog API: 
https://bugs.openjdk.java.net/browse/JDK-8077931
The webrev is at http://cr.openjdk.java.net/~fyuan/jjiang/8077931/webrev.00/
Best regards,
John Jiang