RFR 9: 8067808 : java/lang/ProcessBuilder/Basic.java failed on Assertion

[Roger Riggs]

Please review test cleanup to make process id testing more reliable.
It now spawns javaChild to report the child pid instead of parsing
the output of OS specific commands.

Webrev:
    http://cr.openjdk.java.net/~rriggs/webrev-builder-8067808/

Issue:
    http://cr.openjdk.java.net/~rriggs/webrev-builder-8067808/

Thanks, Roger

p.s. I'm looking for a review also for:
8081567 : java/lang/ProcessHandle/InfoTest.java failed Cannot run 
program "whoami"