[Merge] lp:~xnox/ubuntu-archive-publishing/migrate-dist-upgrade-to-4k into lp:ubuntu-archive-publishing

[Brian Murray]

We decided, in #ubuntu-release, that I'd reupload ubuntu-release-upgrader that way we can have it in -proposed for testing rather than resigning.
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https://code.launchpad.net/~xnox/ubuntu-archive-publishing/migrate-dist-upgrade-to-4k/+merge/311181
Your team Ubuntu Package Archive Administrators is requested to review the proposed merge of lp:~xnox/ubuntu-archive-publishing/migrate-dist-upgrade-to-4k into lp:ubuntu-archive-publishing.