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Fixes #46, #50
This change is in reaction to the following PR: ros-controls/ros2_control#1659 where a timeout is added for the switch controller service. This timeout is hardcoded as 5 seconds here: https://github.com/ros-controls/ros2_control/blob/8779757f7e5cdb5e6998d9b162e65015003e3c1f/controller_manager/controller_manager/spawner.py#L332
Further discussion should be had on proposing to parameterize that timeout so that we can adapt for low resource sims which are slow to launch and/or making the timeout based on ROS time.