Remove default robot_ip from launchfiles

CHANGELOG.md

franka_control/config/franka_control.yaml

franka_control/launch/franka_control.launch

...lers/launch/cartesian_impedance_example_controller.launch

...ntrollers/launch/cartesian_pose_example_controller.launch

...llers/launch/cartesian_velocity_example_controller.launch

...xample_controllers/launch/force_example_controller.launch

...trollers/launch/joint_impedance_example_controller.launch

...ntrollers/launch/joint_position_example_controller.launch

...ntrollers/launch/joint_velocity_example_controller.launch

...xample_controllers/launch/model_example_controller.launch

franka_example_controllers/launch/move_to_start.launch

franka_gripper/launch/franka_gripper.launch

franka_visualization/launch/franka_visualization.launch