Change test to work with Foxy and posterior action API #111
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This PR ros2/rclcpp#1311 fixed a bug in rclcpp_action but had to change API for that, the Foxy API remains the same.
I haven't found a way to have specify a
goal_response_callbackcompatible with both API versions, so instead I use the future obtained after sending the goal, so we don't have to branch the code for a test.