Update license header

Signed-off-by: Sandro Lutz <sandro.lutz@temparus.ch>

core/Controller/LoginController.php

@@ -1,8 +1,10 @@
 <?php
 /**
+ * @copyright Copyright (c) 2017, Sandro Lutz <sandro.lutz@temparus.ch>
  * @copyright Copyright (c) 2016 Joas Schilling <coding@schilljs.com>
  * @copyright Copyright (c) 2016, ownCloud, Inc.
  *
+ * @author Sandro Lutz <sandro.lutz@temparus.ch>
  * @author Christoph Wurst <christoph@owncloud.com>
  * @author Joas Schilling <coding@schilljs.com>
  * @author Lukas Reschke <lukas@statuscode.ch>

lib/private/User/Session.php

@@ -1,7 +1,9 @@
 <?php
 /**
+ * @copyright Copyright (c) 2017, Sandro Lutz <sandro.lutz@temparus.ch>
  * @copyright Copyright (c) 2016, ownCloud, Inc.
  *
+ * @author Sandro Lutz <sandro.lutz@temparus.ch>
  * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
  * @author Bernhard Posselt <dev@bernhard-posselt.com>
  * @author Christoph Wurst <christoph@owncloud.com>