Fixup mock lidar

tracking/lidar_cache.py

@@ -38,6 +38,8 @@ class LidarCache():
         # Create the 0MQ socket first. This should not be passed between threads.
         self._mFactory = sender
 
+        # Batch over scans, so we don't need to do our own batching to determine groups
+        # TODO: Implement custom batching, as iter_scans can be unreliable
         for scan in self.lidar.iter_scans(min_len=self.measurements):
             print('Got %d measurments' % (len(scan)))
             if(not self.run):