RFR 8144308: com/sun/jdi/SuspendThreadTest.java failed with "transport error 202: send failed: Broken pipe"

[Jaroslav Bachorik]

Please, review the following simple test change

Issue : https://bugs.openjdk.java.net/browse/JDK-8144308
Webrev: http://cr.openjdk.java.net/~jbachorik/8144308/webrev.00

The test keeps the debuggee spinning in a loop and does not stop it once 
the testing is over. While the harness usually takes care of this, 
occasionally it fails while trying to do that.

The fix is to add a loop invariant variable and set it to false once we 
are done with the debugee and it is ok for it to finish.

Thanks,

-JB-