thresholds.conf in rubber-2.13.0

- old
+ new

@@ -1,6 +1,6 @@
 <%
-  is_worker_instance = rubber_instances[rubber_env.host].role_names.include?('resque_worker')
+  is_worker_instance = rubber_instance.role_names.include?('resque_worker')
 
   @path = '/etc/collectd/thresholds.d/thresholds.conf'
 %>
 # Threshold configuration for collectd(1).
 #