Now the kcrypt configuration will be just a block (`kcrypt`) in the regular
kairos configuration files.
We will use the config mechanism of looking up in multiple directories
becase the old code was only looking at `/oem` but at boot time
(initramfs) the configuration was present in `/sysroot/oem`.
The reason it "worked" was that we had a bug and a sealedvolume was
matching our request simply because we sent an empty UUID/Label/Name
and the sealedvolume had and empty UUID (empty matches empty, right?)
With that fixed on the challenger server side, it became obvious that we
never actually read the partition_info file because we were looking for
it at the wrong place.
Signed-off-by: Dimitris Karakasilis <dimitris@karakasilis.me>
