[Merge] ~patviafore/livecd-rootfs/+git/livecd-rootfs:replace_kernel_before_grub_configuration into livecd-rootfs:ubuntu/master

[Pat Viafore]

Testing is still needed on this MP on AWS and GKE minimal images. We especially need to test on Oracle minimal where it is expected we have an initramfs (for oracle reasons)
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https://code.launchpad.net/~patviafore/livecd-rootfs/+git/livecd-rootfs/+merge/399745
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~patviafore/livecd-rootfs/+git/livecd-rootfs:replace_kernel_before_grub_configuration into livecd-rootfs:ubuntu/master.