Refactor to playbook and split data structure out

* Split single security group variable into one per type
* Moves 'default' security group from role into variable
* Moves default security group variables back to openshift-common role
* Converts openstack-security-group role into playbook
* Playbook called on every openstack-create invocation as before
* Simplifies security group tasks and removes type bhecking
* Iterate through seucrity groups and build a comma-separated list of groups