message: consisten namespace usage in joint walls.cpp
diff: #include <iostream>
  #include <sstream>
  -using franka_example_controllers::JointWall;
  +namespace franka_example_controllers {
  JointWall::JointWall(const double& soft_upper_joint_position_limit,
  const double& soft_lower_joint_position_limit,
  @@ -150,3 +150,5 @@ JointWall::MotionInWall JointWall::getMotionInWall(const double& q, const double
  }
  return MotionInWall::EnteringNormal;
  }
  +
  +} // namespace franka_example_controllers
  