Fix various callbacks when using IPv6 based deployment.
Do not attempt to restore erroneously cloned zram partitions.
Convert LVM names to new LVM names consistent with source naming scheme.
Push new kernel command line into /boot/loader and /etc/kernel/cmdline.
Main difference from EL8 is different grub strategy. To cope, capture
the uuid of new /boot and manipulate the
stub grub.cfg with the right uuid.
In EL8, the efi has the main grub, EL9 changes to have /boot host the 'real' grub,
causing us to have to modify the stub grub.