use overlayfs for /etc

recipes-diya/diya-overlay/files/confd

@@ -6,6 +6,9 @@ DESC="Auto deployment configuration from media"
 case "$1" in
     start)
         echo -n "Start $DESC: "
+        # mount the overlay which is not auto mount by fstab
+        # this make /etc editable
+        mount -t overlay -o lowerdir=/etc,upperdir=/var/etc/upper,workdir=/var/etc/work overlay /etc
         # for some reason the LCD backlight is turned off
         # need to turn it on manually
         echo  0 > /sys/class/backlight/backlight/bl_power
@@ -31,7 +34,6 @@ case "$1" in
         # display information
         # disable wifi power save
         /usr/sbin/iw wlan0 set power_save off
-        /sbin/ip a
     ;;
     *)
         N=/etc/init.d/$NAME