AutopilotTester: Speed up polling w speed factor

If sim is running faster, we should also poll faster to keep the
same timing resolution. This fixed quite a large number of test
failures.

test/mavsdk_tests/autopilot_tester.h

@@ -169,13 +169,22 @@ class AutopilotTester
 	{
 		const std::chrono::microseconds duration_us(duration);
 
+		// Hopefully this is often enough not to have PX4 time out on us.
+		auto realtime_sleep_duration = std::chrono::milliseconds(1);
+
+		if (speed_factor.has_value()) {
+			// If sim is running faster than realtime, we need to
+			// speed up polling (which happens w.r.t. real time) to
+			// maintain the check resolution w.r.t. sim time
+			realtime_sleep_duration /= speed_factor.value();
+		}
+
 		if (_telemetry && _telemetry->attitude_quaternion().timestamp_us != 0) {
 
 			const int64_t start_time_us = _telemetry->attitude_quaternion().timestamp_us;
 
 			while (true) {
-				// Hopefully this is often enough not to have PX4 time out on us.
-				std::this_thread::sleep_for(std::chrono::milliseconds(1));
+				std::this_thread::sleep_for(realtime_sleep_duration);
 
 				const int64_t elapsed_time_us = _telemetry->attitude_quaternion().timestamp_us - start_time_us;
 
@@ -236,7 +245,14 @@ class AutopilotTester
 	bool poll_condition_with_timeout(
 		std::function<bool()> fun, std::chrono::duration<Rep, Period> duration)
 	{
-		static constexpr unsigned check_resolution = 100;
+		unsigned check_resolution = 100;
+
+		if (speed_factor.has_value()) {
+			// If sim is running faster than realtime, we need to
+			// speed up polling (which happens w.r.t. real time) to
+			// maintain the check resolution w.r.t. sim time
+			check_resolution *= speed_factor.value();
+		}
 
 		const std::chrono::microseconds duration_us(duration);