RFR (S): 8023101 java/lang/management/MemoryMXBean/ResetPeakMemoryUsage.java fails

[Staffan Larsen]

Please review this small update to the test. The fix allows for no change in heap usage to happen during a GC.

webrev: http://cr.openjdk.java.net/~sla/8023101/webrev.00/
bug: http://bugs.sun.com/view_bug.do?bug_id=8023101 (not available yet)
jbs: https://jbs.oracle.com/bugs/browse/JDK-8023101

Thanks,
/Staffan