Bash array for commands

Modify code in [docker.py](https://github.com/CESNET/tesp-api/blob/a950f35194589b4c02c3c03a18736ab4a1d78fd9/tesp_api/utils/docker.py#L112) to use bash array or [shlex join command](https://docs.python.org/3/library/shlex.html#shlex.join) for correct escaping of generated `run_script` commands.