Provide graceful shutdown on debug stop action

Author: snjeza

com.microsoft.java.debug.core/src/main/java/com/microsoft/java/debug/core/adapter/handler/DisconnectRequestHandler.java

@@ -26,6 +26,7 @@ public void destroyDebugSession(Command command, Arguments arguments, Response r
         IDebugSession debugSession = context.getDebugSession();
         if (debugSession != null) {
             if (disconnectArguments.terminateDebuggee && !context.isAttached()) {
+                debugSession.detach();
                 debugSession.terminate();
             } else {
                 debugSession.detach();