Switch to using the rclpy context manager everywhere. #389
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This lets us use less code, but still effectively
manage the lifetime of the rclpy.init. We also
change ExternalShutdownException handling to
work just like a KeyboardInterrupt.
This is one of the last PRs before we can close out ros2/rclpy#1280
@sloretz FYI
This should really be merged simultaneously with ros2/ros2_documentation#4586