[Merge] ~waveform/livecd-rootfs:general-tidy into livecd-rootfs:ubuntu/master

[Steve Langasek]

cat > /etc/fstab << EOM
LABEL=cloudimg-rootfs   /        ext4   discard,commit=30,errors=remount-ro     0 1
EOM

If the current code is clobbering /etc/fstab anyway, and this works, why rewrite in awk instead of just dropping the unnecessary sed command?
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https://code.launchpad.net/~waveform/livecd-rootfs/+git/livecd-rootfs/+merge/450874
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