[entities] fetch_order -> cw_fetch_order (closes #3306293)

entities.py

@@ -11,7 +11,7 @@
 class Link(AnyEntity):
     """customized class for Link entities"""
     __regid__ = 'Link'
-    fetch_attrs, fetch_order = fetch_config(['title', 'url'])
+    fetch_attrs, cw_fetch_order = fetch_config(['title', 'url'])
 
     def dc_title(self):
         return u'%s (%s)' % (self.title, self.url)