Added scripts to create, remap and destroy virtual serial ports.

script/launch_sim.sh

+#!/bin/bash 
+
+# create virtual serial port
+socat -d -d pty,raw,echo=0,link=/tmp/darwin_driver pty,raw,echo=0,link=/tmp/usart3_sim_serial_fw &
+
+ln -s /tmp/darwin1_user /tmp/usart1_sim_serial_fw

script/stop_sim.sh

+killall socat
+
+rm /tmp/usart1_sim_serial_fw