[Merge] ~mwhudson/ubuntu-seeds/+git/ubuntu:seed-initramfs-tools into ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:oracular

[Sebastien Bacher]

Review: Approve

Ok, we discussed it directly, there might be cases like containers where it's not strictly needed
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https://code.launchpad.net/~mwhudson/ubuntu-seeds/+git/ubuntu/+merge/467256
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