RFR(S) : 8156681 : Add jtreg wrapper for hotspot gtest tests

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev/8156681/webrev.00/
> 71 lines changed: 71 ins; 0 del; 0 mod;

Hi all,

could you please integrate this small fix which adds a jtreg wrapper to run gtest tests?
 
JBS: https://bugs.openjdk.java.net/browse/JDK-8156681
webrev: http://cr.openjdk.java.net/~iignatyev/8156681/webrev.00/

Thanks,
— Igor