backup: simplify auto-renaming handling
backup: simplify auto-renaming handling

Don't try to track names in restore_info_verify, instead resolve them at
actual restore time.

marmarek/qubes-core-admin,marmarek/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin