Open Stack

I updated the implementation section of https://wiki.openstack.org/wiki/Heat/Blueprints/as-update-policy on instance naming to support UpdatePolicy where in the case of the LaunchConfiguration change, all the instances need to be replaced and to support MinInstancesInService, the handle_update should create new instances first before deleting old ones in a batch per MaxBatchSize (i.e., group capacity of 2 with MaxBatchSize=2 and MinInstancesInService=2).  Please review as I may not understand the original motivation for the existing scheme in instance naming.  Thanks.