Steering controllers library open_loop mode

[christophfroehlich]

Describe the bug
The open_loop mode of the steering controllers library is not working.

To Reproduce
Steps to reproduce the behavior:

1. Checkout the CarLike demo [Example 11] Carlike Robot using Bicycle Steering Controller ros2_control_demos#316
2. Set the open_loop parameter to true
3. Check the results, the robot is not moving.

Expected behavior
Ideal odometry

Environment (please complete the following information):

• Version : Rolling

Additional context
I think the issue is that the variables here are never set

ros2_controllers/steering_controllers_library/include/steering_controllers_library/steering_controllers_library.hpp

Lines 135 to 137 in f7c13ad

	// store last velocity
	double last_linear_velocity_ = 0.0;
	double last_angular_velocity_ = 0.0;

but used here

ros2_controllers/ackermann_steering_controller/src/ackermann_steering_controller.cpp

Line 61 in f7c13ad

odometry_.update_open_loop(last_linear_velocity_, last_angular_velocity_, period.seconds());

ros2_controllers/bicycle_steering_controller/src/bicycle_steering_controller.cpp

Line 59 in f7c13ad

odometry_.update_open_loop(last_linear_velocity_, last_angular_velocity_, period.seconds());

ros2_controllers/tricycle_steering_controller/src/tricycle_steering_controller.cpp

Line 59 in f7c13ad

odometry_.update_open_loop(last_linear_velocity_, last_angular_velocity_, period.seconds());