[Merge] ~racb/ubuntu-sponsoring:python3 into ubuntu-sponsoring:master

[Benjamin Drung]

The mentioned rebase landed in the main branch which produces an Ubuntu package (see https://code.launchpad.net/~ubuntu-sponsors/+recipe/ubuntu-sponsoring-daily) for consumption on the new infrastructure.
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https://code.launchpad.net/~racb/ubuntu-sponsoring/+git/ubuntu-sponsoring/+merge/418022
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