Fix a couple socket tests for short read/write

tests/standalone/io/secure_server_socket_test.dart

Index: tests/standalone/io/secure_server_socket_test.dart
diff --git a/tests/standalone/io/secure_server_socket_test.dart b/tests/standalone/io/secure_server_socket_test.dart
index d3e2d1cd512e20a7f878cb5a52d6a035c520d0ac..2af05101e9b19b09646fc779ae442fbb952e5389 100644
--- a/tests/standalone/io/secure_server_socket_test.dart
+++ b/tests/standalone/io/secure_server_socket_test.dart
@@ -116,7 +116,8 @@ void testSimpleConnectFail(SecurityContext serverContext,
       // TODO(whesse): When null context is supported, disallow
       // the ArgumentError type here.
       Expect.isTrue(error is ArgumentError ||
-                    error is HandshakeException);
+                    error is HandshakeException ||
+                    error is SocketException);
       clientEndFuture.then((_) {
         if (!cancelOnError) server.close();
         asyncEnd();