Ubuntu 22.04 recipes and switch from preseed to autoinstall

Switch Ubuntu install from preseed to autoinstall (cloudinit).

• amd64
  • build from_scratch/ubuntu-22.04.yaml
  • build ubuntu2204-amd64-min.yaml
  • deploy ubuntu2204-amd64-min
  • Jenkins env_test_generate-snapshot
  • Jenkins env_test_snapshot
• ppc64le (POWER 8 no more supported)
  • build from_scratch/ppc64le/ubuntu-22.04.yaml : iso boot crash : daily 2022-03-28/22.04-beta/2022-04-12 (idem sous debian10-big)
  • build ubuntu2204-ppc64-min.yaml
  • deploy ubuntu2204-ppc64-min
  • Jenkins env_test_generate-snapshot
  • Jenkins env_test_snapshot
• arm64
  • build from_scratch/aarch64/ubuntu-22.04.yaml : qemu sendkeys is not working (idem sous debian10-big)
  • build ubuntu2204-arm64-min.yaml
  • deploy ubuntu2204-arm64-min
  • Jenkins env_test_generate-snapshot
  • Jenkins env_test_snapshot
• update to released iso instead of daily builds + find the latest installer_iso_url actually fixed in from_scratch/*ubuntu-22.04.yaml (via installer_iso_finder ?)