RFR(S) : 8166262 : failurehandler should not use jtreg internal API

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev/8166262/webrev.00/
> 62 lines changed: 56 ins; 2 del; 4 mod;

Hi all,

could you please review this small patch which removes usage of jtreg internal 
API from failurehandler lib?

JBS: https://bugs.openjdk.java.net/browse/JDK-8166262
webrev: http://cr.openjdk.java.net/~iignatyev/8166262/webrev.00/

Thanks,
— Igor