Need reviewer - Fixing demo/jvmti tests and correcting problem list

[Kelly O'Hair]

Need reviewer:

6899444: Fix demo/jvmti tests so they can run in jtreg samevm mode, cleanup problemlist
http://cr.openjdk.java.net/~ohair/openjdk7/jdk7-tl-samevm-6899444/webrev/

Fixed the demo/jvmti tests so they work in samevm mode (samevm
mode changes the current directory setting), and removed them from
the problem list.

Also removed some jdi tests from the problem list (Tim fixed them earlier).

-kto