[Merge] ~ubuntu-core-dev/grub/+git/ubuntu:feature/initrd-less-boot-with-fallback-cleanup into ~ubuntu-core-dev/grub/+git/ubuntu:ubuntu

[Chris Glass]

Review: Approve

Looks good. +1

(This was pair programmed between vorlon and I during a sprint "coding day" last week)
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https://code.launchpad.net/~ubuntu-core-dev/grub/+git/ubuntu/+merge/341272
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