[Merge] ~xypron/grub:disable_lf2 into ~ubuntu-core-dev/grub/+git/ubuntu:ubuntu

[dann frazier]

Review: Approve

OK, after wiping the egg off of my face, I can confirm it works :)

Let me know if you'd like me to merge/upload, or if Foundations already plans to do so. (I don't know, for example, if there are other fixes for known bugs that should be applied at the same time).
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https://code.launchpad.net/~xypron/grub/+git/grub/+merge/419407
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