[Merge] lp:~xnox/system-service/python3 into lp:system-service

[Martin Pitt]

Review: Approve

LGTM, except this bit:

65	- print (model, layout, variant, options)
66	+ print((model, layout, variant, options))

which I assume is an overzealous 2to3 artifact. I'll revert that, and otherwise upload. Thanks!
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https://code.launchpad.net/~xnox/system-service/python3/+merge/192805
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