disk-label: Prepare for extenting
disk-label: Prepare for extenting

We are going to add limited support for ext4 and Linux GPT partitions.

This moves try-ext2-files and (interpose-filesystem) earlier to be called
from try-gpt-dos-partition.

This simplifies UUID defining and handling.

This should cause no behavioral change.

Signed-off-by: Alexey Kardashevskiy <ac1fc56530d7d037e1ea666f130daca22d72f964@ozlabs.ru>

stefanberger/SLOF-tpm,aik/SLOF,qemu/SLOF,qemu/SLOF,stefanberger/SLOF-tpm,aik/SLOF,stefanberger/SLOF-tpm,qemu/SLOF,aik/SLOF