Re: [libvirt] [PATCH 3/3] systemd: Modernize machine naming

So, systemd-machined has this philosophy that machine names are like hostnames and hence should follow the same rules. But we always allowed international characters in domain names. Thus we need to modify the machine name we are passing to systemd. In order to change some machinenames that we will be passing to systemd, we also need to call TerminateMachine at the end of a lifetime of a domain. Even for domains that were started with older libvirt. That can be achieved thanks to virSystemdGetMachineNameByPID(). And because we can change machine names, we can get rid of the inconsistent and pointless escaping of domain names when creating machine names. So this patch modifies the naming in the following way. It tries using the name we were using earlier (without escaping the name, see above) and if that is not possible, because it doesn't follow the rules given by systemd, it then fallbacks to using <drivername>-<uuid> instead. That way we can start domains we couldn't start before. Well, at least on systemd.