Disable PX4IO debug - spams console on comms failure. Each command does report the failure separately, so we get a better feedback level without the spam.

src/drivers/px4io/px4io.cpp

@@ -505,7 +505,7 @@ PX4IO::PX4IO(device::Device *interface) :
 	/* open MAVLink text channel */
 	_mavlink_fd = ::open(MAVLINK_LOG_DEVICE, 0);
 
-	_debug_enabled = true;
+	_debug_enabled = false;
 	_servorail_status.rssi_v = 0;
 }