images: fix stale header comments and drop unset $SUDO

[ROKUMATE]

Leftovers from the containers/automation_images import:

• get_fedora_url.sh:3 — "called by the Makefile". No Makefile in this repo; build.sh:72-73
  calls it.
• fedora_packaging.sh:3-6, debian_packaging.sh:3-6 — "called from fedora_setup.sh and
  various Dockerfiles… assumes lib.sh has been sourced". None of those exist. Real callers are
  build.sh via virt-customize and container-images/podman_cidev/Containerfile.
• fedora_packaging.sh:216 — pipes to $SUDO tee, but SUDO came from lib.sh and is set
  nowhere here, so it expands to empty. debian_packaging.sh uses a bare tee in the same place.
• fedora_packaging.sh:23 — # shellcheck disable=SC2154 no longer suppresses anything.