RFR(S): 6952105 TEST_BUG: testcase failure, not very often, com/sun/jdi/SuspendThreadTest.java

[Staffan Larsen]

Updated the test to use proper synchronization and notification between 
threads. Should be more stable and much faster.

bug: https://bugs.openjdk.java.net/browse/JDK-6952105
webrev: http://cr.openjdk.java.net/~sla/6952105/webrev.00/

Thanks,
/Staffan