Review request for 6961894: TEST_BUG: jdk_lang tests fail in samevm mode

[Mandy Chung]

Another patch of test fixes - with these fixes, there are now 5 
remaining tests in ProblemList.txt excluded for jdk_lang test target.

6961894: TEST_BUG: jdk_lang tests fail in samevm mode

Webrev at:
   http://cr.openjdk.java.net/~mchung/6961894/webrev.00/

- Some tests are marked to run in othervm mode
- Some java/lang/management tests are cleaned up to restore the state 
before it finishes.
- java/lang/reflect/Proxy and a few tests have its custom classloader.  
Fix them to use the proper parent class loader.

Thanks
Mandy