add privacy provider

to fix unit test failure

classes/privacy/provider.php

@@ -0,0 +1,54 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+/**
+ * Privacy Subsystem implementation for auth_outage.
+ *
+ * @package    auth_outage
+ * @copyright  2018 Olivier SECRET <olivier.secret@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace auth_outage\privacy;
+
+defined('MOODLE_INTERNAL') || die();
+
+use core_privacy\local\legacy_polyfill;
+
+/**
+ * Privacy provider for the authentication manual.
+ *
+ * @copyright  2018 Carlos Escobedo <carlos@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class provider implements
+    \core_privacy\local\metadata\null_provider {
+
+    use legacy_polyfill;
+
+    /**
+     * Get the language string identifier with the component's language
+     * file to explain why this plugin stores no data.
+     *
+     * This function is compatible with old php version. (Diff is the underscore '_' in the beginning)
+     * But the get_reason is still available because of the trait legacy_polyfill.
+     *
+     * @return  string
+     */
+    public static function _get_reason() {
+        return 'privacy:no_data_reason';
+    }
+
+}