[Bug 1849298] Re: unattended-upgrade is checking o=UbuntuESM, a=eoan-security when disabled in config

[Dominic]

Not sure I can close the bug. Nevertheless it's confusing to have this
configuration in two places. Maybe deserves a review.

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Title:
  unattended-upgrade is checking o=UbuntuESM,a=eoan-security when
  disabled in config

Status in unattended-upgrades package in Ubuntu:
  New

Bug description:
  My /etc/apt/apt.conf.d/50unattended-upgrades file looks like this:

  Unattended-Upgrade::Allowed-Origins {
          "${distro_id}:${distro_codename}";
          "${distro_id}:${distro_codename}-security";
          // Extended Security Maintenance; doesn't necessarily exist for
          // every release and this system may not have it installed, but if
          // available, the policy for updates is such that unattended-upgrades
          // should also install from here by default.
  //      "${distro_id}ESM:${distro_codename}";
  //      "${distro_id}ESM:${distro_codename}-security";
          "${distro_id}:${distro_codename}-updates";
          "${distro_id}:${distro_codename}-proposed";
          "${distro_id}:${distro_codename}-backports";
  };

  Nevertheless, the logs show that o=UbuntuESM,a=eoan-security is
  allowed for updates despite not being enabled in config:

  2019-10-22 08:10:46,075 INFO Initial blacklist :
  2019-10-22 08:10:46,077 INFO Initial whitelist:
  2019-10-22 08:10:46,077 INFO Starting unattended upgrades script
  2019-10-22 08:10:46,077 INFO Allowed origins are: o=Ubuntu,a=eoan, o=Ubuntu,a=eoan-security, o=Ubuntu,a=eoan-updates, o=Ubuntu,a=eoan-proposed, o=Ubuntu,a=eoan-backports, o=UbuntuESM,a=eoan-security

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