[US] Automated OpenStack Deployment with Ansible

It's better to have modular Ansible scripts - one main playbook that calls component-specific playbooks. Here's why:

- Maintainability: Each OpenStack service (Keystone, Nova, Neutron, etc.) has distinct configuration requirements
- Reusability: Component playbooks can be run independently for updates/troubleshooting
- Team Collaboration: Different team members can work on different service playbooks simultaneously
- Testing: You can test individual components without running the entire stack
- Idempotency: Easier to ensure each service deployment is idempotent