Adding shutdown callback to bauserver

src/de/steamwar/bungeecore/Bauserver.java

@@ -7,7 +7,11 @@ public class Bauserver extends Subserver {
     private final UUID owner;
 
     public Bauserver(String serverName, UUID owner, int port, String... command) {
-        super(Servertype.BAUSERVER, serverName, port, command);
+        this(serverName, owner, port, () -> {}, command);
+    }
+
+    public Bauserver(String serverName, UUID owner, int port, Runnable shutdownCallback, String... command) {
+        super(Servertype.BAUSERVER, serverName, port, shutdownCallback, command);
         this.owner = owner;
     }