Fix race conditions in action client #1164
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This addresses the race conditions described in #878, by implementing essentially the same solution as #871.
Additionally, I also implement #838 which was implemented in the regular client but not the action client.
The one thing it does not address is that
rclpy/rclpy/rclpy/executors.py
Lines 453 to 454 in 0a02395
can potentially execute without the future having been added to the list, in which case the future's callbacks will execute immediately instead of being delegated to the task queue.