Comment 19 for bug 1890803

@Sean you're right... the cloud-init fix was to handle the case there is *no* /etc/fstab ...
so any other place that expects /etc/fstab to exist must also handle missing file.

Looking at overlayroot, it expects to be able to update/modify the baked-in fstab, but it's not there.

https://git.launchpad.net/cloud-initramfs-tools/tree/overlayroot/scripts/init-bottom/overlayroot#n313