[Merge] ~codyshepherd/ubuntu-seeds:recommend-grub-legacy-ec2 into ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:xenial

[Steve Langasek]

Review: Needs Fixing

we don't want this as a recommends, it should be dropped entirely from the seed.
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https://code.launchpad.net/~codyshepherd/ubuntu-seeds/+git/ubuntu-seeds/+merge/390850
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