RFR: 8042266: [launcher] create test groups for launcher regression tests

[Kumar Srinivasan]

Hi,

Simple changes to add jdk_launcher to the jdk's Test.groups, this allows 
anyone working
on the launcher to run a set of regression tests which historically have
helped shake out launcher regressions.
http://cr.openjdk.java.net/~ksrini/8042266/webrev.00/

Usage:
jtreg ......  /blah/de/blah/jdk/test:jdk_launcher

Thanks
Kumar