dmesg: libceph: bad option at 'conf=/etc/pve/ceph.conf'
After the upgrade to PVE 6 with Ceph Luminous, the mount.ceph helper
doesn't understand the conf= option yet. And the CephFS mount with the
kernel client fails. After upgrading to Ceph Nautilus the option exists
in the mount.ceph helper.
Signed-off-by: Alwin Antreich <a.antreich@proxmox.com>