RFR(XS) : 8197113 : combine multiple @key tags in jtreg tests

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8197113/webrev.00/index.html
> 47 lines changed: 11 ins; 29 del; 7 mod;

Hi all,

could you please review this small fix for jtreg tests? jtreg doesn't support multiple @key tags, this fix replaces multiple @key tags by one tag w/ combined value.

webrev: http://cr.openjdk.java.net/~iignatyev//8197113/webrev.00/index.html
JBS: https://bugs.openjdk.java.net/browse/JDK-8197113

Thanks,
-- Igor