Allow to override the default ansible-playbook command

[kenorb]

Currently ansible-playbook is hardcoded as:

let cmd = ["ansible-playbook", playbook]

I need it to prefix with wsl on Windows.

Would be good to allow some variable to override the default command, e.g.

cmd = os.environ.get('ANSIBLE_PLAYBOOK', 'ansible-playbook').split() + [playbook]

?

[dawidd6]

Sure, a new input for this could be added. Feel free to PR.