Modified control loops to run in bot3.

Change-Id: I5d9d461c8a10dc1c54fee69273809f76328df655
diff --git a/bot3/control_loops/update_drivetrain.sh b/bot3/control_loops/update_drivetrain.sh
old mode 100644
new mode 100755
index 369cbc5..b5757d3
--- a/bot3/control_loops/update_drivetrain.sh
+++ b/bot3/control_loops/update_drivetrain.sh
@@ -4,6 +4,8 @@
 
 cd $(dirname $0)
 
+export PYTHONPATH=../../frc971/control_loops/python
+
 ./python/drivetrain.py drivetrain/drivetrain_dog_motor_plant.h \
     drivetrain/drivetrain_dog_motor_plant.cc \
     drivetrain/drivetrain_clutch_motor_plant.h \