Add option to force default server

src/main/java/net/md_5/bungee/Configuration.java

@@ -133,6 +133,7 @@ public class Configuration
      */
     public String statsUuid = UUID.randomUUID().toString();
     public boolean metricsEnabled = true;
+    public boolean forceDefaultServer = false;
 
     /**
      * Load the configuration and save default values.

src/main/java/net/md_5/bungee/InitialHandler.java

@@ -77,7 +77,8 @@ public class InitialHandler implements Runnable
                     }
 
                     UserConnection userCon = new UserConnection(socket, in, out, handshake, customPackets);
-                    userCon.connect(BungeeCord.instance.config.getServer(handshake.username, handshake.host));
+                    String server = (BungeeCord.instance.config.forceDefaultServer) ? BungeeCord.instance.config.defaultServerName : BungeeCord.instance.config.getServer(handshake.username, handshake.host);
+                    userCon.connect(server);
                     break;
                 case 0xFE:
                     socket.setSoTimeout(100);