Merged requested to merge microcolonel/redoxfs:add-getuuid into master
redoxfs --get-uuid <disk> prints out the UUID of the
provided redoxfs disk image.
This is needed especially for aarch64 kernels where the UUID of the boot disk needs to be passed to the kernel by the bootloader. With this extension to the mount command, the kernel build glue can query the prepared redoxfs image for it's UUID.