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Download and verify release ISO image

We download the target release ISO from the web or copy an image
specified by “--iso” argument.

We use SHA256SUMS and SHA256SUMS.gpg downloaded from the web to verify
the download.

We grab the most recent ISO version for the target release from the ISO
download page to download the ISO image and the SHA256SUMS files.

• scripts/Upgrade-Auto: New option “--iso” to copy an image.
  New option “--limit-rate” to specify max download speed for wget.
  (download_iso): Download and verify ISO image.
  (download_with_wget): Download a file with wget.
  (check_iso): Verify SHA256SUMS signature and then ISO SHA256.
  (build_release_url): Build the release ISO download page URL.
  (build_iso_name): Build the ISO name for a version, autodetect
  architecture.
  (get_most_recent_version): Get the most recent stable version from the
  release download page.
  (ExtractEOLEVersions): HTMLParser listing all the versions on the
  download page.

Ref: #10876

Move pre_download after sources.list generation

The pre_download/90-fill-apt-cache need to get an updated sources.list
when apt-cacher-ng is in use.

Ref: #10876

Make pylint happier and fix some spacing

Ref: #10876

Fix messages displayed on console

Ref: #10876

Upgrade-Auto: fix proxy handling

Get proxy from creoled and pass it to every functions which need it.

We need to disable environment variable since init_proxy will export
apt-cacher-ng which could not be used to download ISO and SHA256SUMS
files.

As the server to migrate is in production, we dont care about user
http_proxy environment variable (gen_config has the good value).

• scripts/Upgrade-Auto (get_most_recent_version): Use an
  “urllib2.ProxyHandler()”. Take care to disable autodetection of proxy
  if proxy is not defined.
  (download_with_wget): env must be an empty dictionary to disable
  environment variable exported by “init_proxy()”.
  (build_release_url): Pass proxy to “get_most_recent_version()”.
  (check_iso): Pass proxy to “download_with_wget()”.
  (download_iso): Calculate proxy. Pass it to “build_release_url()”,
  “check_iso()” and “download_with_wget()”.

Ref: #10876