Add unique serial numbers to sample X509 certificates. Remove the "sendClientCertificate" parameter…

tests/standalone/io/secure_socket_renegotiate_client.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.
 
 // Client for secure_socket_renegotiate_test, that runs in a subprocess.
 // The test verifies that client certificates work, if the client and server
 // are in separate processes, and that connection renegotiation can request
 // a client certificate to be sent.
 
 import "dart:async";
@@ skipping 23 matching lines @@
 void expect(condition) {
   if (!condition) {
     throw new ExpectException('');
   }
 }
 
 
 void runClient(int port) {
   SecureSocket.connect(HOST_NAME,
                        port,
-                       context: clientContext,
-                       sendClientCertificate: true)
+                       context: clientContext)
     .then((SecureSocket socket) {
       X509Certificate certificate = socket.peerCertificate;
       expect(certificate != null);
       expectEquals('CN=localhost', certificate.subject);
       expectEquals('CN=myauthority', certificate.issuer);
       StreamIterator<String> input = new StreamIterator(socket
           .transform(UTF8.decoder)
           .transform(new LineSplitter()));
       socket.writeln('first');
       input.moveNext()
@@ skipping 18 matching lines @@
           expect(success != true);
           socket.close();
         });
     });
 }
 
 
 void main(List<String> args) {
   runClient(int.parse(args[0]));
 }