Fabian von Feilitzsch 15345e1620
[python] Cleanup ThreadPool with atexit rather than __del__ (#5094)
* [python] Cleanup ThreadPool with atexit rather than __del__

This removes the `__del__` function from the generated Python client,
and replaces it with a `cleanup` function. When a ThreadPool is created,
the cleanup function is registered with the `atexit` module.

This fixes #5093, where the API client could hang indefinitely at
garbage collection.

* Update petstore examples

* Test to ensure threadpool is cleaned up

* Docs now encourage using the context manager

* Regenerate docs

* Update samples
2020-01-28 21:58:11 -08:00
..
2018-04-21 11:54:40 +08:00