Tune drivetrain.

Add force knob, efficiency, IMU

Change-Id: I4fd12665490d4e535d5890c2edf8ae611938333d
diff --git a/y2017/control_loops/python/drivetrain.py b/y2017/control_loops/python/drivetrain.py
index b4635ee..74b114d 100755
--- a/y2017/control_loops/python/drivetrain.py
+++ b/y2017/control_loops/python/drivetrain.py
@@ -19,7 +19,8 @@
                                           q_pos_low = 0.12,
                                           q_pos_high = 0.14,
                                           q_vel_low = 1.0,
-                                          q_vel_high = 0.95)
+                                          q_vel_high = 0.95,
+                                          has_imu = False)
 
 def main(argv):
   argv = FLAGS(argv)