RFR: 8224252: [TESTBUG] hotspot/test/serviceability/sa/sadebugd/SADebugDTest.java is timing out again after fix for JDK-8163805

[Yasumasa Suenaga]

Hi all,

Please review this change.
This webrev has passed all tests on submit repo
(mach5-one-ysuenaga-JDK-8224252-3-20190523-0532-2647154).

  JBS: https://bugs.openjdk.java.net/browse/JDK-8224252
  webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8224252/webrev.00/

JDK-8163805 was suppose to fix a timeout issue with this test and also
removed it off the problemlist. However, it still times out on
windows-x64 about 1/3 of the time. It passes every time on all the
other platforms.

Root cause of this is `jhsdb debugd` could not be exited normally.

`jhsdb debugd` (internally, DebugServer.java) would detach from
debuggee at shutdown hook. So jhsdb process need to be exited
normally.
`jhsdb debugd` could not exit itself without external operation (e.g.
CTRL+C, signals). Thus we use Process::destroy for it.
In the case of Windows, Process::destroy calls TerminateProcess()
Windows API to terminate process. However it would terminate target
process immediately and it would not give a chance to kick shutdown
hook. (It is documented on Javadoc of Runtime::addShutdownHook)


Thanks,

Yasumasa