changing thread frequency definition to setRate function

src/gripper_client_alg_node.cpp

@@ -5,7 +5,7 @@ GripperClientAlgNode::GripperClientAlgNode(void) :
   gripper_module("gripper_module",ros::this_node::getName())
 {
   //init class attributes if necessary
-  this->loop_rate_ = 10;//in [Hz]
+  this->setRate(10);//in [Hz]
 
   // [init publishers]