[PVE-User] pve-cluster won't start with large ssh_known_hosts

[Dietmar Maurer]

> I have tracked this down to /usr/bin/pvecm, which calls
> PVE::Cluster::ssh_merge_known_hosts(...),
> which calls PVE::Tools::file_get_contents($sshglobalknownhosts, 128*1024),
> which calls PVE::Tools::safe_read_from(...), which dies because the maximum
> length is exceeded.
> 
> If you happen to install Proxmox VE on top of an existing Debian system, as I
> tried to do, and this error occurs, then pve-cluster and all of its dependent
> packages will fail to be configured.

Why is that file that large?

- Dietmar