Ansible provisioner for CloudStack Simulator

Finally I implemented the Ansible provisioner for simstack in such manner that it is a straight merge. 

@datasmid I am afraid I am still confusing you :( what I was trying to do is to install both cloudstack and Riak (from basho) so that we would get a EC2 and a S3 based simulator. Here calling this repo the cloudstack repo but pointing to the basho repo is misleading. you should rename this to riak.repo