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/BUILD b/y2018/control_loops/superstructure/BUILD
index 1a2aa5e..5dabd1b 100644
--- a/y2018/control_loops/superstructure/BUILD
+++ b/y2018/control_loops/superstructure/BUILD
@@ -41,6 +41,7 @@
     srcs = [
         "superstructure_lib_test.cc",
     ],
+    shard_count = 5,
     deps = [
         ":superstructure_lib",
         ":superstructure_queue",