[Merge] ~powersj/livecd-rootfs:xenial/revert-grub into livecd-rootfs:ubuntu/xenial

[Joshua Powers]

Joshua Powers has proposed merging ~powersj/livecd-rootfs:xenial/revert-grub into livecd-rootfs:ubuntu/xenial.

Commit message:
amd64: revert all grub changes for xenial

For LP: #1901906, on other releases we ensured that grub-pc is always
installed with shim-signed. However, xenial has different behavior that
does not work the same. This reverts those changes back to what
livecd-rootfs was before any of those changes were made, keeping only
the autoremove packages work.

LP: #1901906

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1901906 in livecd-rootfs (Ubuntu): "amd64 images should have correct set of bootloaders installed"
  https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/1901906

For more details, see:
https://code.launchpad.net/~powersj/livecd-rootfs/+git/livecd-rootfs-1/+merge/394910

Due to autopackagetest regressions found when trying to install these packages:
https://launchpadlibrarian.net/509847168/livecd-rootfs_2.408.61_2.408.64.diff.gz

As such this revert to what is in the archive today.
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~powersj/livecd-rootfs:xenial/revert-grub into livecd-rootfs:ubuntu/xenial.
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