[Merge] ~codyshepherd/livecd-rootfs/+git/livecd-rootfs:serialize-systemd-grub into livecd-rootfs:ubuntu/master

[Cody Shepherd]

Cody Shepherd has proposed merging ~codyshepherd/livecd-rootfs/+git/livecd-rootfs:serialize-systemd-grub into livecd-rootfs:ubuntu/master.

Commit message:
Add systemd config to serialize invocations of grub-editenv (LP: #1910815)

Requested reviews:
  Canonical Cloudware (cloudware)
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1910815 in grub2 (Ubuntu): "race on boot between multiple invocations of grub-editenv"
  https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1910815

For more details, see:
https://code.launchpad.net/~codyshepherd/livecd-rootfs/+git/livecd-rootfs/+merge/397752
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~codyshepherd/livecd-rootfs/+git/livecd-rootfs:serialize-systemd-grub into livecd-rootfs:ubuntu/master.
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