[Merge] lp:~nacc/ubuntu-seeds/ubuntu.xenial into lp:~ubuntu-core-dev/ubuntu-seeds/ubuntu.xenial

[Steve Langasek]

Review: Approve

Yes, this looks right. I'm going to double-check that all of these new package names are already available (so we don't break any seds due to missing packages), then apply this so that we can start dealing with components-mismatches in parallel with the bootstrap.
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https://code.launchpad.net/~nacc/ubuntu-seeds/ubuntu.xenial/+merge/285932
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