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Graceful shutdown of Python process using threads

spawner.py spawns a single thread, but only installs SIGINT handler if started with --cleanup option.

cd test_python
../test_docker/bench.sh

output:

python_teardown_subprocesses uses an image, skipping
python_teardown_subprocesses_with_cleanup uses an image, skipping
Creating network "test_python_default" with the default driver
Creating test_python_python_teardown_subprocesses_with_cleanup_1 ... done
Creating test_python_python_teardown_subprocesses_1              ... done
               Name                             Command               State   Ports
-----------------------------------------------------------------------------------
test_python_python_teardown_subpro   python /mnt/spawner.py           Up
cesses_1
test_python_python_teardown_subpro   python /mnt/spawner.py --c ...   Up
cesses_with_cleanup_1

Time to stop:
/test_python_python_teardown_subprocesses_1
10.880
/test_python_python_teardown_subprocesses_with_cleanup_1
1.651
Attaching to test_python_python_teardown_subprocesses_1, test_python_python_teardown_subprocesses_with_cleanup_1
python_teardown_subprocesses_with_cleanup_1  | Script started with {'cleanup': True}
python_teardown_subprocesses_1               | Script started with {'cleanup': False}