IcingaUserField: add missing field class

library/Director/Objects/IcingaUserField.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Icinga\Module\Director\Objects;
+
+use Icinga\Module\Director\Data\Db\DbObject;
+
+class IcingaUserField extends DbObject
+{
+    protected $keyName = array('user_id', 'datafield_id');
+
+    protected $table = 'icinga_user_field';
+
+    protected $defaultProperties = array(
+        'user_id'       => null,
+        'datafield_id'  => null,
+        'is_required'   => null
+    );
+}