Updated test-init to only create fstab symlink as needed.

test/test-init

@@ -2,11 +2,11 @@
 exec >/dev/console 2>&1
 export TERM=linux
 export PS1='initramfs-test:\w\$ '
-ln -s /proc/mounts /etc/fstab
+[ -f /etc/fstab ] || ln -s /proc/mounts /etc/fstab
 stty sane
 echo "made it to the rootfs!"
 echo 3 >/proc/sys/vm/drop_caches
 free
 sh -i
-mount -o remount,ro /
+mount -n -o remount,ro /
 poweroff -f