optimize imports and cleanup code

backlight.py

@@ -10,9 +10,6 @@ import logging
 _log=logging.getLogger(__name__)
 import epics
 
-#from app_config import settings
-#from app_utils import assert_motor_positions
-
 class Backlight(object):
   def __init__(self, prefix: str='SAR-EXPMX:MOT_BLGT',pos={'pos_in':-30500,'pos_out':1000,'pos_diode':-30500}):
     if prefix is None:
@@ -44,7 +41,6 @@ class Backlight(object):
     m.move(target, ignore_limits=True, wait=wait)
 
 
-
 if __name__ == "__main__":
   import time,os
   import argparse