Added tests for basic standalone install

* Preparing for clustering work.
* Renamed the Vagrant host to standalone so we can add a set of nodes for
  clustering.
* Removed the rabbitmq_policy this is now in upstream ansible.
* Moved attributes from the Vagrantfile to params in the playbook.
* Added integration tests for this baseline functionality.
Updated with new changes from master
Flush handlers before tests begin + rebase
Merge pull request #17

* Prepare the playbook for clustering support
* Add test for the standalone installation