Do not configure the port if talking to PX4 units (since USB does not know anything about baud rate)
Avoid ANY configuration action in serial link if not strictly required by user
Avoid evil port config for CDC devices altogether, non-CDC devices (unknown devices) should be unaffected
Read UART faster to prevent buffer overflows
Merge branch 'no_portconfig' of github.com:mavlink/qgroundcontrol
Added Sky Hunter config