[Merge] ~jawn-smith/grub:systemd-ordering into ~ubuntu-core-dev/grub/+git/ubuntu:master

[Dimitri John Ledkov]

Review: Needs Fixing

the two are equivalent.

grub-common.service => /dev/null symlink should be shipped

and rm_conffile to remove grub-common init.d
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https://code.launchpad.net/~jawn-smith/grub/+git/grub/+merge/397765
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