Review request for JDK-8051561: Convert JAXP function tests: javax.xml.xpath.* to jtreg (testNG) tests

[Eric Wang]

Hi Joe, alan and every one

I'm working on jaxp functional test colocation which is traced by the 
bug JDK-8043091 <https://bugs.openjdk.java.net/browse/JDK-8043091>.
We have finished to convert a few suite and the jaxp/xpath tracked by 
bug JDK-8051561 <https://bugs.openjdk.java.net/browse/JDK-8051561> is 
the first one chosen for public review.

Can you please review the webrev below? your comments given would be 
helpful for our future work.
http://cr.openjdk.java.net/~ewang/JDK-8051561/webrev.00/

Thanks,
Eric