Fixed bugs and finalized setup to run get/set priority test

- Fixed a bug in k_process where we weren't actually setting priority of
the current running process because I took out default a while back
- Added test result statements
- Fixed a bug where I forgot to set test_passing to 1 instead of 0
- Forgot that P2-P6 don't run until P1 releases processor, so now
releasing instead of sending message to P2 (but P3-P6 should be blocked
after running P2)