RFR JDK-8215425: vmTestbase/nsk/jvmti/PopFrame should provide more detailed output

[Alex Menkov]

Hi all,

please review the fix for
https://bugs.openjdk.java.net/browse/JDK-8215425
webrev:
http://cr.openjdk.java.net/~amenkov/popframe_cleanup/webrev.01/

The fix
- turns on detailed output for the tests and cleaned related stuff;
- for popframe002 deletes output from run() method as it caused 
unexpected MethodExit event;
- removes "test case 2" in popframe004 test as it's never executed.

--alex