Get_EUI64

In order to map the motes names and their MAC address (EUI64), we have to run a specific firmware on the motes. The firmware periodically sends the motes EUI64 to UART. Then the get_eui64.py script is there to gather this information and creates a file called motes_mac.csv containing the EUI64<-->Node mapping:

python get_eui64.py <site_name> 01bsp_eui64_prog.elf