Made sure airspeed tests reset the sensors to default state

src/drivers/ets_airspeed/ets_airspeed.cpp

@@ -383,6 +383,10 @@ test()
 		warnx("diff pressure: %d pa", report.differential_pressure_pa);
 	}
 
+	/* reset the sensor polling to its default rate */
+	if (OK != ioctl(fd, SENSORIOCSPOLLRATE, SENSOR_POLLRATE_DEFAULT))
+		errx(1, "failed to set default rate");
+
 	errx(0, "PASS");
 }