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/y2018/control_loops/superstructure/superstructure_main.cc b/y2018/control_loops/superstructure/superstructure_main.cc
index f5b026c..789f13f 100644
--- a/y2018/control_loops/superstructure/superstructure_main.cc
+++ b/y2018/control_loops/superstructure/superstructure_main.cc
@@ -5,11 +5,13 @@
 
 int main() {
   ::aos::InitNRT(true);
+
   ::aos::ShmEventLoop event_loop;
   ::y2018::control_loops::superstructure::Superstructure superstructure(
       &event_loop);
-  ::aos::GoRT();
-  superstructure.Run();
+
+  event_loop.Run();
+
   ::aos::Cleanup();
   return 0;
 }