[Merge] lp:~psusi/ubuntu/vivid/grub-installer/fix-efi-multi-disk-installs into lp:ubuntu/grub-installer

[Mathieu Trudel-Lapierre]

Review: Needs Fixing

Hmm, but now we have an issue with changelog. Would you mind fixing this on top? No need to resubmit, just adjust the changelog to resolve conflicts there and I'll merge then.
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https://code.launchpad.net/~psusi/ubuntu/vivid/grub-installer/fix-efi-multi-disk-installs/+merge/247772
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