Distribution EOLE

Upgrade-Auto: we need a specialized sources.list

Upgrading to 2.6.2 requires to force the AMD64 architecture.

We define the target Envole release to avoid the need to execute
Maj-Auto after Upgrade-Auto.

• upgrade/Upgrade-Auto: define Envole release based on EOLE one.
  (main): pass Ubuntu, EOLE and Envole releases to run-parts scripts.
  Display some more informations to follow the upgrade of containers.
  Do not configure the sources.list with “pyeole.pkg”.
  (upgrade_container_source): copy the “sources.list” from the master
  to each containers.

• upgrade/pre_download/01-configure-sources-list: generate a
  sources.list with “arch=amd64” and Envole repository.

Ref: #22545
Ref: #22500

Upgrade-Auto: do not confuse user with “apt-get update” warnings

Just before the “apt-cacher” cache is populated, “apt-get update”
display warnings and the script looks like it hangs.

• upgrade/pre_download/90-fill-apt-cache (populate_apt_cacher_cache):
  display a message before filling the cache and after.

• upgrade/pre_download/90-fill-apt-cache (populate_apt_cache): ditoo.

Ref: #22545
Ref: #22500