Add performance flavor logstash workers to cacti

* modules/openstack_project/manifests/cacti.pp: Replacement logstash
workers have been created and we have more of them, so the numbering
increased to two digits. The entries with single digits will be
retired and can be removed after those servers are eventually
deleted.

Change-Id: I7ab9d96052ecb4aaaea033af27d5878fc7363512