IcingaCommand,Service,User: support custom vars

library/Director/Objects/IcingaCommand.php

@@ -18,6 +18,8 @@ class IcingaCommand extends IcingaObject
         'object_type'           => null,
     );
 
+    protected $supportsCustomVars = true;
+
     protected function renderMethods_execute()
     {
         // Execute is a reserved word in SQL, column name was prefixed

library/Director/Objects/IcingaService.php

@@ -36,6 +36,8 @@ class IcingaService extends IcingaObject
 
     protected $supportsGroups = true;
 
+    protected $supportsCustomVars = true;
+
     protected function renderCheck_command_id()
     {
         return $this->renderCommandProperty($this->check_command_id);

library/Director/Objects/IcingaUser.php

@@ -20,6 +20,8 @@ class IcingaUser extends IcingaObject
 
     protected $supportsGroups = true;
 
+    protected $supportsCustomVars = true;
+
     protected function renderEnable_notifications()
     {
         return $this->renderBooleanProperty('enable_notifications');