[Merge] ~hmollercl/software-properties:ubuntu/master into software-properties:ubuntu/master

[Julian Andres Klode]

Review: Needs Fixing

Please make the get_dependencies function a method of SoftwareProperties, so it can be shared by both implementations, rather than duplicated, and then optimally, rebase the thing into one commit.

Or I might just as well do that myself, seeing timezones.
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https://code.launchpad.net/~hmollercl/software-properties/+git/software-properties/+merge/382349
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