ZP-1193 Update license in Net/SMTP.php to BSD-2-clause

Following an upstream license change, see
https://github.com/pear/Net_SMTP/issues/43 .

Released under the Affero GNU General Public License (AGPL) version 3.

src/backend/imap/Net/SMTP.php

@@ -3,15 +3,33 @@
 // +----------------------------------------------------------------------+
 // | PHP Version 5 and 7                                                  |
 // +----------------------------------------------------------------------+
-// | Copyright (c) 1997-2015 The PHP Group                                |
-// +----------------------------------------------------------------------+
-// | This source file is subject to version 3.01 of the PHP license,      |
-// | that is bundled with this package in the file LICENSE, and is        |
-// | available at through the world-wide-web at                           |
-// | http://www.php.net/license/3_01.txt.                                 |
-// | If you did not receive a copy of the PHP license and are unable to   |
-// | obtain it through the world-wide-web, please send a note to          |
-// | license@php.net so we can mail you a copy immediately.               |
+// | Copyright (c) 1997-2017 Jon Parise and Chuck Hagenbuch               |
+// | All rights reserved.                                                 |
+// |                                                                      |
+// | Redistribution and use in source and binary forms, with or without   |
+// | modification, are permitted provided that the following conditions   |
+// | are met:                                                             |
+// |                                                                      |
+// | 1. Redistributions of source code must retain the above copyright    |
+// |    notice, this list of conditions and the following disclaimer.     |
+// |                                                                      |
+// | 2. Redistributions in binary form must reproduce the above copyright |
+// |    notice, this list of conditions and the following disclaimer in   |
+// |    the documentation and/or other materials provided with the        |
+// |    distribution.                                                     |
+// |                                                                      |
+// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  |
+// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT    |
+// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS    |
+// | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE       |
+// | COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
+// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
+// | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;     |
+// | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER     |
+// | CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT   |
+// | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN    |
+// | ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE      |
+// | POSSIBILITY OF SUCH DAMAGE.                                          |
 // +----------------------------------------------------------------------+
 // | Authors: Chuck Hagenbuch <chuck@horde.org>                           |
 // |          Jon Parise <jon@php.net>                                    |
@@ -42,6 +60,7 @@
  * @author  Chuck Hagenbuch <chuck@horde.org>
  * @author  Jon Parise <jon@php.net>
  * @author  Damian Alejandro Fernandez Sosa <damlists@cnba.uba.ar>
+ * @license http://opensource.org/licenses/bsd-license.php BSD-2-Clause
  *
  * @example basic.php   A basic implementation of the Net_SMTP package.
  */