Plane: faster startup

make it less likely to send wrong INS_PRODUCT_ID, plus don't waste as
much time

ArduPlane/system.pde

@@ -419,15 +419,8 @@ static void startup_INS_ground(bool do_accel_init)
     }
 
     if (style == AP_InertialSensor::COLD_START) {
-        gcs_send_text_P(SEVERITY_MEDIUM, PSTR("Warming up ADC..."));
-        mavlink_delay(500);
-
-        // Makes the servos wiggle twice - about to begin INS calibration - HOLD LEVEL AND STILL!!
-        // -----------------------
-        demo_servos(2);
-
         gcs_send_text_P(SEVERITY_MEDIUM, PSTR("Beginning INS calibration; do not move plane"));
-        mavlink_delay(1000);
+        mavlink_delay(100);
     }
 
     ahrs.init();