updated minor optimization and bug fix for python gripper interface

sas_robot_driver_franka/__init__.py

@@ -7,15 +7,10 @@ from sas_robot_driver_franka._qros_franka_robot_dynamics_py import RobotDynamics
 import rclpy
 from rclpy.node import Node
 from rclpy.client import Client
-# from sas_common import rclcpp_init, rclcpp_Node, rclcpp_spin_some, rclcpp_shutdown
 from sas_robot_driver_franka_interfaces.srv import Move, Grasp
 from std_srvs.srv import Trigger
 from sas_robot_driver_franka_interfaces.msg import GripperState
 import os
-import threading
-from queue import Queue
-import time
-import struct
 
 MOVE_TOPIC_SUFFIX = "move"
 GRASP_TOPIC_SUFFIX = "grasp"