[Merge] ~renanrodrigo/update-notifier:file-based-motd-disable-focal into update-notifier:focal

[Renan Rodrigo]

Renan Rodrigo has proposed merging ~renanrodrigo/update-notifier:file-based-motd-disable-focal into update-notifier:focal.

Requested reviews:
  Nick Rosbrook (enr0n)
Related bugs:
  Bug #2015420 in update-notifier (Ubuntu): "motd: can't disable esm-related messages"
  https://bugs.launchpad.net/ubuntu/+source/update-notifier/+bug/2015420

For more details, see:
https://code.launchpad.net/~renanrodrigo/update-notifier/+git/update-notifier/+merge/461705

update-motd: use a marker file to hide esm updates information

Instead of a flag passed to the script, check for the existence of a marker file coming from the Pro Client. This implements the same control level for both tools.
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