[Merge] lp:~vorlon/ubuntu/saucy/grub2/uefi-sb-netboot into lp:~ubuntu-core-dev/ubuntu/saucy/grub2/saucy

[Steve Langasek]

Worked with Colin on IRC to get this sorted, apparently trusting a built-in prefix of /grub instead of trying to specify a device gives much better results.

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https://code.launchpad.net/~vorlon/ubuntu/saucy/grub2/uefi-sb-netboot/+merge/184857
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