Add v6Only named argument to ServerSocket and etc.

tests/standalone/io/socket_ipv6_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:io';
 import 'dart:isolate';
 
 const ANY = InternetAddressType.ANY;
 
 void testIPv6toIPv6() {
@@ skipping 70 matching lines @@
     if (list.length < 0) throw "no addresse";
     for (var entry in list) {
       if (entry.type != InternetAddressType.IP_V4) {
         throw "Wrong IP type";
       }
     }
     port.close();
   });
 }
 
+void testIPv4toIPv6_IPV6Only() {
+  InternetAddress.lookup("::0", type: ANY)
+      .then((serverAddr) {
+        ServerSocket.bind(serverAddr.first, 0, v6Only: true)
+            .then((server) {
+              server.listen((socket) {
+                throw "Unexpcted socket";
+              });
+              Socket.connect("127.0.0.1", server.port).catchError((error) {
+                server.close();
+              });
+            });
+      });
+}
+
 void main() {
   testIPv6toIPv6();
   testIPv4toIPv6();
   testIPv6toIPv4();
   testIPv4toIPv4();
   testIPv6Lookup();
   testIPv4Lookup();
+
+  testIPv4toIPv6_IPV6Only();
 }