[Merge] lp:~vorlon/ubuntu-archive-publishing/xenial-support into lp:ubuntu-archive-publishing

[Adam Conrad]

Review: Approve

LGTM.  The Xenial = Trusty assertion may prove incorrect after polling the flavours, but it works for now.
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https://code.launchpad.net/~vorlon/ubuntu-archive-publishing/xenial-support/+merge/284341
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