TemplateRepository: Let us clear the instance cache

library/Director/Repository/IcingaTemplateRepository.php

@@ -114,4 +114,9 @@ class IcingaTemplateRepository
 
         return $db->fetchCol($query);
     }
+
+    public static function clear()
+    {
+        static::clearInstances();
+    }
 }

library/Director/Repository/RepositoryByObjectHelper.php

@@ -91,4 +91,9 @@ trait RepositoryByObjectHelper
 
         return self::$auth;
     }
+
+    protected static function clearInstances()
+    {
+        self::$instances = [];
+    }
 }