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

[Thomas Bechtold]

Review: Approve

clean backport from ubuntu/master . LGTM
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https://code.launchpad.net/~codyshepherd/livecd-rootfs/+git/livecd-rootfs/+merge/398897
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~codyshepherd/livecd-rootfs/+git/livecd-rootfs:buildd/hide-grub-menu-gg into livecd-rootfs:ubuntu/groovy.