[Merge] update-notifier:list-oem into update-notifier:master

[Iain Lane]

Iain Lane has proposed merging update-notifier:list-oem into update-notifier:master.

Requested reviews:
  Julian Andres Klode (juliank)

For more details, see:
https://code.launchpad.net/~ubuntu-core-dev/update-notifier/+git/update-notifier/+merge/389424

This goes with https://code.launchpad.net/~ubuntu-core-dev/update-manager/oem/+merge/389421

I wanted to have it out of update-manager's process, to keep update-manager always "fast" to launch - running ubuntu-drivers list-oem is pretty slow. It doesn't matter if update-notifier is slow though, since it runs in the background.
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