If --numeric-owner is neither used when creating or extracting the archive
containing the rootfs then tar tries to change the numeric uid/gid of the
files based on user/group names of the host used to extract the archive.
Create the archive with --numeric-owner to remove the burden of having to
use --numeric-owner when extracting.
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com> Signed-off-by: Ross Burton <ross.burton@intel.com>