[Merge] ~xnox/livecd-rootfs:fix-misisng-systemd-detect-virt into livecd-rootfs:ubuntu/master

[John Chittum]

Review: Approve

+1 from a CPC member. There's a double call of undivert_grub that'll happen in some of our downstream hooks leading to the deletion of systemd-detect-virt.
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https://code.launchpad.net/~xnox/livecd-rootfs/+git/livecd-rootfs/+merge/397435
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~xnox/livecd-rootfs:fix-misisng-systemd-detect-virt into livecd-rootfs:ubuntu/master.