[Merge] ~patviafore/livecd-rootfs/+git/livecd-rootfs:initramfs_less_boot_focal into livecd-rootfs:ubuntu/focal

[Pat Viafore]

Pat Viafore has proposed merging ~patviafore/livecd-rootfs/+git/livecd-rootfs:initramfs_less_boot_focal into livecd-rootfs:ubuntu/focal.

Commit message:
Boot with an initramfs by default in cloud images,

When using a non-generic kernel, no change is made. Additionally, there is now a mechanism to detect initrdless boot fallback. When we attempt to boot with an initramfs and fail,
initrdless_boot_fallback_triggered is set to non-zero in the grubenv.
This value can be checked after boot by looking in /boot/grub/grubenv
or by using the grub-editenv list command.

Fixes double-boot issue in LP: #1870189

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
  Canonical Cloudware (cloudware)
Related bugs:
  Bug #1870189 in linux-azure (Ubuntu): "initramfs does not get loaded"
  https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1870189

For more details, see:
https://code.launchpad.net/~patviafore/livecd-rootfs/+git/livecd-rootfs/+merge/397376

Previous MPs in Groovy : 

https://code.launchpad.net/~davidkrauser/livecd-rootfs/+git/livecd-rootfs/+merge/387862
https://code.launchpad.net/~davidkrauser/livecd-rootfs/+git/livecd-rootfs/+merge/386913
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~patviafore/livecd-rootfs/+git/livecd-rootfs:initramfs_less_boot_focal into livecd-rootfs:ubuntu/focal.
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