Fix SecureSocket tests to look up localhost only once, where possible.

sdk/lib/io/secure_server_socket.dart

 // Copyright (c) 2012, 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.
 
 part of dart.io;
 
 /**
  * The [SecureServerSocket] is a server socket, providing a stream of high-level
  * [Socket]s.
  *
@@ skipping 161 matching lines @@
    * name.  Otherwise, it is looked up as a nickname.
    *
    * To request or require that clients authenticate by providing an SSL (TLS)
    * client certificate, set the optional parameters requestClientCertificate or
    * requireClientCertificate to true.  Require implies request, so one doesn't
    * need to specify both.  To check whether a client certificate was received,
    * check SecureSocket.peerCertificate after connecting.  If no certificate
    * was received, the result will be null.
    */
   static Future<RawSecureServerSocket> bind(
-      String address,
+      address,
       int port,
       String certificateName,
       {int backlog: 0,
        bool v6Only: false,
        bool requestClientCertificate: false,
        bool requireClientCertificate: false}) {
     return RawServerSocket.bind(address, port, backlog: backlog, v6Only: v6Only)
         .then((serverSocket) => new RawSecureServerSocket._(
             serverSocket,
             certificateName,
@@ skipping 81 matching lines @@
       _subscription = _socket.listen(_onData,
                                      onDone: _onDone,
                                      onError: _onError);
     } else {
       close();
     }
   }
 }