MAGETWO-62357: Change serializer for metadata in UrlRewrite model and unit tests

app/code/Magento/UrlRewrite/Setup/UpgradeData.php

 <?php
 /**
- * Copyright © 2017 Magento. All rights reserved.
+ * Copyright © 2013-2017 Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
 namespace Magento\UrlRewrite\Setup;

app/code/Magento/UrlRewrite/Test/Unit/Service/V1/Data/UrlRewriteTest.php

 <?php
 /**
- * Copyright © 2017 Magento. All rights reserved.
+ * Copyright © 2013-2017 Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
 namespace Magento\UrlRewrite\Test\Unit\Service\V1\Data;