Activate sshd service + add default PW for root

Hi @mvallim, 

great writeup! I wounderd if you are able to add a preseed or cloudinit file, that automaticly set a hostname, default User with PW and starts a ssh server.

This Steps are needed if you want to PXE Boot the Maschine and configure it after wards with Ansible.

I am open for suggestions or ideas.

Best,
Daniel
