[Merge] lp:~mvo/ubuntu-archive-publishing/sync-cnf-metadata into lp:ubuntu-archive-publishing

[Michael Vogt]

Michael Vogt has proposed merging lp:~mvo/ubuntu-archive-publishing/sync-cnf-metadata into lp:ubuntu-archive-publishing.

Requested reviews:
  Ubuntu Package Archive Administrators (ubuntu-archive)

For more details, see:
https://code.launchpad.net/~mvo/ubuntu-archive-publishing/sync-cnf-metadata/+merge/356117

This PR adds pulling the command-not-found metadata from the juju machine that extracts the data to the right place. It is modeled after the appstream data. This means that we can (finally!) get rid of the command-not-found-data package and use dynamic and up-to-date metadata in command not found. This will also enable c-n-f to display version information once this data is available.

There are two open questions:
- Do we need to open some firewall rules so that the machine that runs this script can rsync from cnf-extrctor.internal?
- We should limit the publishing initially to cosmic (or even cosmic+1). Bionic and later has a config in c-n-f to fetch and use the metadata once its available on the server and we need to double check this with cosmic first. I can change this PR so that it only fetches here or we can do it at the LP side (that is pending), not sure what is the best approach here (advise welcome!).

There is also some support in LP needed, I can look into this next.
-- 
Your team Ubuntu Package Archive Administrators is requested to review the proposed merge of lp:~mvo/ubuntu-archive-publishing/sync-cnf-metadata into lp:ubuntu-archive-publishing.
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