Skip to content for sys-mode installs use rootfs fstab mount options

Currently for sys-mode Alpine installations when the rootfs is mounted the rootfs' /etc/fstab is not consulted for any mount options specified there. Whilst this can be worked around by specifying the "rootflags" cmdline option it makes more sense by read these from the rootfs' fstab by default.

However for run-from-ram systems a remount does occur using mount options from the rootfs' fstab.

Closes aports#13544

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