feat(python): clarify/simplify test setup

[AIexanderDicke]

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• Adds script to copy rawScripts to be used by the python package
• Simplify setting up the python tests
• redis-cli not needed in order to cleanup redis before starting tests

[manast]

Thanks for the PR. I wonder, when is copy_scripts.py supposed to be called?

[AIexanderDicke]

@manast This script should be called before running the tests. You could also add the command to run_tests.sh, but I didn't want to change the functionality of this script.

[manast]

I think if generating the scripts is necessary to make sure the tests are running with the latest lua script, it should be called in run_tests.sh. What do you think @roggervalf ?