by putting it on one line, we make the prompts work correctly.

This makes it easier to edit the copy-paste.

Modify documentation to add a new ganeti instance with information about where to add a reverse dns entry in hetzner

The rationale here is we don't want to extend trust from the old
machine, which we do by giving them root access on the new server. By
giving root access to the *old* server, we don't give it access to
anything it already has (or will have, in the case of the ganeti
nodes).