RFR: 7109087: gc/7072527/TestFullGCCount.java fails when GC is set in command-line

[Kevin Walls]

Hi,

I'd like a review of this testcase change.  It fails as it has a GC 
option set in the jtreg tag which may conflict with what jtreg sends, 
and fail to run.

Although the test was created for a CMS problem, double-counting of full 
collections, here it is adapted to check all collectors:

http://cr.openjdk.java.net/~kevinw/7109087/webrev/

Thanks
Kevin