Remove process_unowned_devices
Remove process_unowned_devices

Now that stratisd reqires libblkid 2.32, and the method is no longer used
for test specific purposes, it is no longer needed.

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

stratis-storage/stratisd,stratis-storage/stratisd,stratis-storage/stratisd