istoreos: write system shutdown message to consoles

package/istoreos-files/files/etc/init.d/debug

@@ -4,8 +4,15 @@
 STOP=00
 
 shutdown() {
-	logger -s -t "DEBUG" "System Shutting Down"
-	logger -t "DEBUG" "System Shutting Down"
+	local message="System Shutting Down"
+	logger -s -t "DEBUG" "$message"
+	logger -t "DEBUG" "$message"
+
+	local consoles="$(cat /sys/class/tty/console/active)"
+	[ -n "$consoles" ] || consoles=console
+	for console in $consoles; do
+		[ -c "/dev/$console" ] && echo "$message" >"/dev/$console"
+	done
 
 	# blink led
 	. /etc/diag.sh