[Merge] ~muktupavels/unity:master into unity:master

[Alberts Muktupāvels]

Alberts Muktupāvels has proposed merging ~muktupavels/unity:master into unity:master.

Commit message:
Port to Python 3.

Requested reviews:
  Dmitry Shachnev (mitya57)

For more details, see:
https://code.launchpad.net/~muktupavels/unity/+git/unity/+merge/359969

Port to Python 3.
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