code cleanup

DELAY_FUNCTION = delay_exponential(initial=0.01, increment=2.0, maximum=5.0)

RETRY_DECORATOR = retry(max_retries=MAX_RETRIES, delay_function=DELAY_FUNCTION, prepare_method_name='connect')

class NetconfSessionHandler:

    def __init__(self, address : str, port : int, **settings) -> None:

        self.__lock = threading.RLock()