JDK 11 RFR(s) JDK-8206865 RMI activation tests fail with InvalidClassException

[Stuart Marks]

Hi all,

Please review this fix for some failing RMI activation tests. Some reflective 
code needed adjustment to take nestmates into account. This also removes the 
failing tests from the problem list.

Webrev:

	http://cr.openjdk.java.net/~smarks/reviews/8206865/webrev.0/

Bug:
	https://bugs.openjdk.java.net/browse/JDK-8206865

Thanks,

s'marks