RFR(S) : 8238943: switch to jtreg 5.0

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8238943/webrev.00
> 10 lines changed: 1 ins; 0 del; 9 mod;

Hi all,

could you please review the patch which changes jtreg version used in jdk/jdk to the latest and greatest -- jtreg 5.0? and as (recently became) usually, this patch also bumps requiredVersion in all the jtreg test suites in order to reduce possible discrepancy in results.

JBS: https://bugs.openjdk.java.net/browse/JDK-8238943
webrev: http://cr.openjdk.java.net/~iignatyev/8238943/webrev.00
testing: tier1-4 

Thanks,
-- Igor