Code review request, 8000456: Add programmatic deadlock detection in SSLEngineDeadlock

[Xuelei Fan]

Hi,

Please review this test update:

http://cr.openjdk.java.net/~xuelei/8000456/webrev.00/

The test case SSLEngineDeadlock.java is used to detect the deadlock in
SSLEngine.  However, the result depends on time out.  It is hard to tell
whether the timeout is caused by deadlock or heavy loaded systems.

In this update, programmatic deadlock detection is introduced. This
update should make it a little easy to identify deadlock from various
timeout causes.

Thanks,
Xuelei