RFR 9: 8133528 : java/lang/ProcessHandle/OnExitTest.java fails intermittently

[Roger Riggs]

Please review this test fix to remove checks for subprocesses not 
spawned by the test.
There are spurious processes (like virus checkers) that show up 
unexpectedly.

webrev:
    http://cr.openjdk.java.net/~rriggs/webrev-onexittest-8133528/

Issue:
   https://bugs.openjdk.java.net/browse/JDK-8133528

Thanks, Roger