Merge pull request #15129 from owncloud/version-command-bus

expire versions in a background command

diff --cc apps/files_versions/lib/storage.php
Simple merge

diff --cc apps/files_versions/tests/versions.php
Simple merge

diff --cc lib/private/command/fileaccess.php
Simple merge

diff --cc lib/private/command/queuebus.php
Simple merge

diff --cc lib/private/hook.php
index 0ede125d64b1e960b6ce69c338d1b266b4a3d952,c4997eeceffb3967d74bdf16144e26bce85b51e8..d2a0fa898dd7cb6ab97cb54554505b31454d43c4
--- 1/lib/private/hook.php
--- 2/lib/private/hook.php
+++ b/lib/private/hook.php
@@@ -1,31 -1,12 +1,33 @@@
  <?php
 -
  /**
 - * This class manages the hooks. It basically provides two functions: adding
 - * slots and emitting signals.
 + * @author Bart Visscher <bartv@thisnet.nl>
 + * @author Jakob Sack <mail@jakobsack.de>
 + * @author Morris Jobke <hey@morrisjobke.de>
 + * @author Robin Appelman <icewind@owncloud.com>
 + * @author Robin McCorkell <rmccorkell@karoshi.org.uk>
 + * @author Sam Tuke <mail@samtuke.com>
 + * @author Thomas Müller <thomas.mueller@tmit.eu>
 + * @author Vincent Petry <pvince81@owncloud.com>
 + *
 + * @copyright Copyright (c) 2015, ownCloud, Inc.
 + * @license AGPL-3.0
 + *
 + * This code is free software: you can redistribute it and/or modify
 + * it under the terms of the GNU Affero General Public License, version 3,
 + * as published by the Free Software Foundation.
 + *
 + * This program is distributed in the hope that it will be useful,
 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 + * GNU Affero General Public License for more details.
 + *
 + * You should have received a copy of the GNU Affero General Public License, version 3,
 + * along with this program.  If not, see <http://www.gnu.org/licenses/>
 + *
   */
  class OC_Hook{
+       public static $thrownExceptions = [];
+ 
        static private $registered = array();
  
        /**