[Merge] ~nteodosio/software-properties:ua-attach-tests into software-properties:ubuntu/master

[Sebastien Bacher]

not a review but just a note from a glance on the changes, if the new build-depends are only for tests you should add <!nocheck> next to those
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https://code.launchpad.net/~nteodosio/software-properties/+git/software-properties/+merge/438462
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