[Merge] lp:~oheoh/command-not-found/command-not-found into lp:command-not-found

[Raphael Kienhöfer]

Raphael Kienhöfer has proposed merging lp:~oheoh/command-not-found/command-not-found into lp:command-not-found.

Commit message:
db creator: Add handling for lz4-compressed command lists from apt

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~oheoh/command-not-found/command-not-found/+merge/383023

Measures were put in place for command-not-found to not need python3-lz4 (universe) to be installed to work, it only is required if one wants to process lz4-compressed apt command lists.

Testing:
- enable apt index compression:
   /etc/apt/apt.conf.d/02compress-indexes:
    Acquire::GzipIndexes "true";
    Acquire::CompressionTypes::Order { "xz"; "gz"; };
    Acquire::Languages { "none"; };
- delete cnf DBs if they already exist
   rm /var/lib/command-not-found/*
- run apt update
- command lists in ls /var/lib/apt/lists/*Commands-* now are lz4-compressed
- command-not-found still works as intended
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~oheoh/command-not-found/command-not-found into lp:command-not-found.
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