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

[Mathieu Trudel-Lapierre]

Review: Needs Fixing

As mentioned on IRC, this is broken, looks like the original support_initrdless_ patch was mangled in the process -- merge shows 'GRUB_DISABLE_INITRD' dropped, but the patch itself seems unchanged in the tree.
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https://code.launchpad.net/~ubuntu-core-dev/grub/+git/ubuntu/+merge/341272
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