RFR: 8204165: Filter out tests requiring class unloading when ClassUnloading is disabled

[Kim Barrett]

> On Jun 1, 2018, at 3:13 AM, Stefan Karlsson <stefan.karlsson at oracle.com> wrote:
> 
> Hi again,
> 
> I decided to tag the stressHierarchy as Coleen suggested:
> http://cr.openjdk.java.net/~stefank/8204165/webrev.03.delta/
> http://cr.openjdk.java.net/~stefank/8204165/webrev.03/
> 
> Thanks,
> StefanK

Looks good.