IcingaCommand: allow formatted timeout (e.g. 1m 4s)

refs #11340

library/Director/Objects/IcingaCommand.php

@@ -29,6 +29,10 @@ class IcingaCommand extends IcingaObject
 
     protected $supportsArguments = true;
 
+    protected $intervalProperties = array(
+        'timeout' => 'timeout',
+    );
+
     protected static $pluginDir;
 
     /**
@@ -83,11 +87,6 @@ class IcingaCommand extends IcingaObject
         return c::renderKeyValue('command', c::renderArray($parts));
     }
 
-    protected function renderTimeout()
-    {
-        return $this->renderPropertyAsSeconds('timeout');
-    }
-
     public static function setPluginDir($pluginDir)
     {
         self::$pluginDir = $pluginDir;