[Merge] lp:~kdub/content-hub/mir-deprecations into lp:content-hub

[Kevin DuBois]

> Please remove the changelog entry.  Otherwise it looks good.  You can run
> through the manual test plan at
> https://wiki.ubuntu.com/Process/Merges/TestPlan/content-hub

There's a fair amount in the test plan that I don't quite understand, but can test best I can...
eg, not sure what "peers" are in this context.
-- 
https://code.launchpad.net/~kdub/content-hub/mir-deprecations/+merge/317770
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