my.cnf in rubber-2.13.0

- old
+ new

@@ -1,10 +1,10 @@
 <%
   @path = "/etc/mysql/my.cnf"
   
   # When sql nodes on same hosts as data nodes, then this config needs to be
   # additive - the mysql_data node gets generated first due to generator order
-  self_instance = rubber_instances[rubber_env.host]
+  self_instance = rubber_instance
   if self_instance.role_names.include?('mysql_data')
     @additive = ['# mysql_sql start', '# mysql_sql end']
   end
   
   mgm_nodes = rubber_instances.for_role('mysql_mgm')