removed old Gripper module imports

stretch_demos/nodes/clean_surface

@@ -14,9 +14,6 @@ from trajectory_msgs.msg import JointTrajectoryPoint
 
 from sensor_msgs.msg import PointCloud2
 
-from control_msgs.msg import GripperCommandAction
-from control_msgs.msg import GripperCommandGoal
-
 from std_srvs.srv import Trigger, TriggerRequest, TriggerResponse
 
 import math

stretch_demos/nodes/grasp_object

@@ -14,9 +14,6 @@ from trajectory_msgs.msg import JointTrajectoryPoint
 
 from sensor_msgs.msg import PointCloud2
 
-from control_msgs.msg import GripperCommandAction
-from control_msgs.msg import GripperCommandGoal
-
 from std_srvs.srv import Trigger, TriggerRequest, TriggerResponse
 
 import math

stretch_demos/nodes/handover_object

@@ -18,9 +18,6 @@ from geometry_msgs.msg import PointStamped
 
 from sensor_msgs.msg import PointCloud2
 
-from control_msgs.msg import GripperCommandAction
-from control_msgs.msg import GripperCommandGoal
-
 from std_srvs.srv import Trigger, TriggerRequest, TriggerResponse
 
 import math

stretch_demos/nodes/hello_world

@@ -14,9 +14,6 @@ from trajectory_msgs.msg import JointTrajectoryPoint
 
 from sensor_msgs.msg import PointCloud2
 
-from control_msgs.msg import GripperCommandAction
-from control_msgs.msg import GripperCommandGoal
-
 from std_srvs.srv import Trigger, TriggerRequest, TriggerResponse
 
 import math

stretch_demos/nodes/open_drawer

@@ -14,9 +14,6 @@ from trajectory_msgs.msg import JointTrajectoryPoint
 
 from sensor_msgs.msg import PointCloud2
 
-from control_msgs.msg import GripperCommandAction
-from control_msgs.msg import GripperCommandGoal
-
 from std_srvs.srv import Trigger, TriggerRequest, TriggerResponse
 
 import math