Support gpt partition tables #19
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This removes the old disk id from the info passed to sfdisk, forcing it to generate a new disk id instead of preserving the old disk id when updating the partition table. This allows removing the code that randomizes the disk id after sfdisk updated the partition table. Also note that this code was previously already redudundant because after initializing there is more code that changes the disk id if it is identical (to support the non-initializing flow, but that is also run when initializing).
This removes some duplicate code, preparing for making that code more complex to support GPT in an upcoming commit.
The sfdisk command has a convenient `--disk-id` option, saving the need to use grep to parse fdisk output.
The sfdisk command already handles most of what is needed. This just removes the last-lba entry from sfdisk partition info (which is based on the source disk size and would otherwise limit the available destination space, if it is omitted the entire destination disk is usable), and makes change_disk_id support generating a longer UUID disk id when a GPT table is in use.
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This is something I needed to make rpi-clone on an orange pi 5 running Armbian, which uses GPT for its SD-card partitions. This was tested in combination with billw2#140 for the base changes to make Armbian work at all (I will rebase that PR as well soon, but it is a bit more complicated).