refactored test cases - resolved bug in spin_some_sequential_execution - update_wait_set
refactored test cases
- resolved bug in spin_some_sequential_execution
- update_wait_set

Signed-off-by: Staschulat Jan <e475a11f0a81ee8b8f81740975325a87bd2cd795@de.bosch.com>

ros2/rclc,ros2/rclc