[Merge] lp:~codyshepherd/livecd-rootfs/uefi-manifests-bionic into lp:~ubuntu-core-dev/livecd-rootfs/bionic-proposed

[Cody Shepherd]

Cosmic changes proposed against trunk: https://code.launchpad.net/~codyshepherd/livecd-rootfs/uefi-manifests-cosmic/+merge/357960
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https://code.launchpad.net/~codyshepherd/livecd-rootfs/uefi-manifests-bionic/+merge/357837
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