feature: Support/use OpenSSH on Windows for Ansible

[DrPsychick]

• [ ] create a similar task to "- name: Template WinRM setup script" that templates the OpenSSH setup script
• [ ] make one the default and allow switching (i.e. windows_ansible_connection = "winrm" or "ssh")
• [ ] refactor code so that the check also depends on the connection method, see task "- name: Wait (up to 10 min) for virtual machines WinRM to be reachable"
• [ ] refactor code so that the inventory reflects the connection method, see task "- name: Generate virsh inventory"