luks-functions: detect non-usb LUKS partitions that can be unlocked with prompted DRK then ask user to confirm that those are all ok to reencryt/change passphrase onto (oem factory reset/manual, whatever)

- cache/reuse that passphrase, used afterward to find which LUKS keyslot contains the DRK, which is used to direct reencryption, also reused for passphrase change.
- refactoring detection + testing of prompted LUKS passphrase for discovered LUKS containers that can be unlocked with same passphrase to prompt user for selection

TODO: remove duplicate luks passphrase unlocking volumes functions for the moment

Signed-off-by: Thierry Laurion <insurgo@riseup.net>

Author: tlaurion