[Merge] lp:~mir-team/platform-api/delete-deprecations into lp:platform-api

[Alberto Aguirre]

Review: Approve

Looks ok, haven't tested.

I should probably rebase this: https://code.launchpad.net/~mir-team/platform-api/remove-mirserver on top of this one given the major revision bump and land them together.
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https://code.launchpad.net/~mir-team/platform-api/delete-deprecations/+merge/254170
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