[Merge] ~vorlon/casper:cleanup into casper:main

[Steve Langasek]

I'm going to go ahead and land this now.  Dropping the unity8 stuff will definitely not impact ubuntu-unity as-is and if they do want this for some reason it can always be resurrected from VCS.
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https://code.launchpad.net/~vorlon/casper/+git/casper/+merge/452496
Your team Unity7 Maintainers Team is requested to review the proposed merge of ~vorlon/casper:cleanup into casper:main.