Convert control loop tests over to simulated event loop

This makes it so that we properly only use ShmEventLoop for running in
realtime on a robot.  Very nice.

Change-Id: I46b770b336f59e08cfaf28511b3bd5689f72fff1
diff --git a/y2019/joystick_reader.cc b/y2019/joystick_reader.cc
index 9ee1a3e..5f5f06c 100644
--- a/y2019/joystick_reader.cc
+++ b/y2019/joystick_reader.cc
@@ -574,9 +574,12 @@
 }  // namespace y2019
 
 int main() {
-  ::aos::Init(-1);
+  ::aos::InitNRT(true);
+
   ::aos::ShmEventLoop event_loop;
   ::y2019::input::joysticks::Reader reader(&event_loop);
-  reader.Run();
+
+  event_loop.Run();
+
   ::aos::Cleanup();
 }