RFR 9: 8086117: java/lang/Runtime/exec/LotsOfOutput.java still fails intermittently with Process consumes memory

[Roger Riggs]

Please review a test change in the algorithm for detecting memory growth to
resolve an intermittent reporting problem.

Webrev:
    http://cr.openjdk.java.net/~rriggs/webrev-lots-8086117/

Issue:
    https://bugs.openjdk.java.net/browse/JDK-8086117

Thanks, Roger