[Merge] ~codyshepherd/livecd-rootfs/+git/livecd-rootfs:buildd/hide-grub-menu-xx into livecd-rootfs:ubuntu/xenial

[Cody Shepherd]

Cody Shepherd has proposed merging ~codyshepherd/livecd-rootfs/+git/livecd-rootfs:buildd/hide-grub-menu-xx into livecd-rootfs:ubuntu/xenial.

Commit message:
Add grub config to buildd images to enable use with lxd vms

Requested reviews:
  Canonical Cloudware (cloudware)
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1915571 in livecd-rootfs (Ubuntu): "Cannot start bash session for buildd vm images in LXD vm"
  https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/1915571

For more details, see:
https://code.launchpad.net/~codyshepherd/livecd-rootfs/+git/livecd-rootfs/+merge/398900
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~codyshepherd/livecd-rootfs/+git/livecd-rootfs:buildd/hide-grub-menu-xx into livecd-rootfs:ubuntu/xenial.
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