[Merge] lp:~malizor/update-manager/ppa-changelogs into lp:update-manager

[Nicolas Delvaux]

Nicolas Delvaux has proposed merging lp:~malizor/update-manager/ppa-changelogs into lp:update-manager.

Commit message:
Retrieve Changelogs from PPA sources if python3-launchpadlib is installed.

This uses the approach suggested by Colin Watson in LP: #253119.

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

For more details, see:
https://code.launchpad.net/~malizor/update-manager/ppa-changelogs/+merge/297119

Retrieve Changelogs from PPA sources if python3-launchpadlib is installed.

This uses the approach suggested by Colin Watson in LP: #253119.

I don't think it would be reasonable to add python3-launchpadlib to the hard dependency list: it would pull it and its dependencies into the default install, which is an additional 3269kB on Xenial.

Therefore, I only set python3-launchpadlib as a suggest dependency and I made the whole feature optional: if launchpadlib is not installed, nothing change except for a new warning in logs to suggest to install the library.
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~malizor/update-manager/ppa-changelogs into lp:update-manager.
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