Ansible 2.0 has depricated the “ssh” from ansible_ssh_user,
ansible_ssh_host, and ansible_ssh_port to become ansible_user,
ansible_host, and ansible_port. If you are using a version of
Ansible prior to 2.0, you should continue using the older style
variables (ansible_ssh_*). These shorter variables are ignored,
without warning, in older versions of Ansible.