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

[Dan Bungert]

Great idea, and the changes look correct to me.
One further iteritems change was needed in my test:

-    for team, team_lpid in SPONSOR_TEAMS.iteritems():
+    for team, team_lpid in SPONSOR_TEAMS.items():

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https://code.launchpad.net/~racb/ubuntu-sponsoring/+git/ubuntu-sponsoring/+merge/418022
Your team Ubuntu Development Team is requested to review the proposed merge of ~racb/ubuntu-sponsoring:python3 into ubuntu-sponsoring:master.