RFR (S): 8227179: Test for new gc+metaspace=info output format

[Kim Barrett]

> On Jul 8, 2019, at 11:09 AM, Tony Printezis <tprintezis at twitter.com> wrote:
> 
> Thanks for pointing that out, Thomas. Updated webrev (the only change is
> the @test comments at the top):
> 
> http://cr.openjdk.java.net/~tonyp/8227179/webrev.1/
> 
> I tested it with a “normal” build (all GCs built) and one with no CMS and
> the test seemed to have done the right thing in both occasions.
> 
> Tony

Looks good.