RFR(S/M) [trivial] 8206429 : [REDO] 8202561 clean up TEST.groups

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8206429/webrev.00/index.html
> 243 lines changed: 0 ins; 124 del; 119 mod; 

Hi all,

could you please review this redo of 8202561? 8202561 was backed out b/c our CI infra didn't support multiple test group files. now such configurations are supported, so 8202561 can be re-integrated.
the patch is the exact 8202561 changeset and it has applied clearly.
 
webrev: http://cr.openjdk.java.net/~iignatyev//8206429/webrev.00/index.html
JBS: https://bugs.openjdk.java.net/browse/JDK-8206429
testing: successfully submitted adhoc jobs which use a "quick" test group in the same way CI system does

Thanks,
-- Igor