[Merge] ~vorlon/ubuntu-seeds/+git/ubuntu-mate:no-mate-optimus into ~ubuntu-mate-dev/ubuntu-seeds/+git/ubuntu-mate:oracular

[Steve Langasek]

Review: Disapprove

per jbicha, we don't actually want to remove mate-optimus in Ubuntu.
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https://code.launchpad.net/~vorlon/ubuntu-seeds/+git/ubuntu-mate/+merge/472932
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