TLS/SSL for Ansible Tower

By default, Ansible Tower uses HTTPS using self-signed certificates at /etc/tower/tower.cert and /etc/tower/tower.key, these can be configured in the setup script. We can also update this later with the same filenames.

For more information visit http://docs.ansible.com/ansible-tower/latest/html/installandreference/install_notes_reqs.html#installation-notes.