not exhaustive of what zfs allows (space is missing), but this
can be done easily without problems
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
those names are allowed for zpools
these will fail for now, but it will be fixed in the next commit
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>