[PVE-User] VM name to log files

[Dietmar Maurer]

> Practically any log, but mostly I would care the datacenter log, because 
> it's hard to distinguish what VM was with ID 210 when I (or my coworker) 
> deleted it 2-4 weeks ago. When I would have a line in log:
> VM 210 - vmname - Destroy. Then it would be a much clearer view.

For now, the datacenter log just list executed background tasks, and they only
contain
VMIDs (no VM name).

But it would be possible to do more detailed logging in syslog...