RFR(M) : 8211171 : move JarUtils to top-level testlibrary

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8211171/webrev.00/index.html
> 182 lines changed: 0 ins; 152 del; 30 mod;

Hi all,

could you please review this small and straightforward patch which moves JarUtils from jdk testlibrary to the top-level testlibrary, removes JarUtils from jaxp testlibrary, and updates all the affected tests?

please note, there is another version of JarUtils in jdk.test.lib.util package, but these two versions have different signatures and behavior, merging them is a bit tricker and will be done separately. 

JBS: https://bugs.openjdk.java.net/browse/JDK-8211171
webrev: http://cr.openjdk.java.net/~iignatyev//8211171/webrev.00/index.html
testing: tier1-3

Thanks,
-- Igor