Show MAC address of network device in combo box (#504216)
    
    We adding a remote repo while performing a CD or DVD install, you're
    presented with netconfig_dialog.  The combo box listing network devices
    used to show 'device_name - description'.  Change this to 'device_name -
    mac_address' to match our other interface listings in anaconda (plus,
    the description available to us now is sort of useless).