Deadlock due to race condition in WebSocketServer.stop

[felixvf]

In line

Java-WebSocket/src/main/java/org/java_websocket/server/WebSocketServer.java

Line 220 in e4c248a

selector.wakeup();

the source code reads

                selector.wakeup();
                selectorthread.interrupt();
                selectorthread.join( timeout );

but it should read

                selectorthread.interrupt();
                selector.wakeup();
                selectorthread.join( timeout );

Else it may happen that the selector thread wakes up and goes to sleep again, and only afterwards the selector thread is marked as interrupted (but nothing happens), which means that the selector thread sleeps forever. Due to the join(), the thread calling stop() will then also sleep forever.