Add console_clean to usage message for simplenode.

priv/templates/simplenode.runner

@@ -147,7 +147,7 @@ case "$1" in
         ;;
 
     *)
-        echo "Usage: $SCRIPT {start|stop|restart|reboot|ping|console|attach}"
+        echo "Usage: $SCRIPT {start|stop|restart|reboot|ping|console|console_clean|attach}"
         exit 1
         ;;
 esac