def stop(self):
        self.server.stop()
Returns file_name if file_name does not exist. If it exists, it appends an underscore until 
dataset/ETHPy150Open facebook/sparts/sparts/tasks/thrift/cppserver.py/CPPServerTask.stop--crossover with--dataset/ETHPy150Open victor-gil-sepulveda/pyProCT/pyproct/tools/scriptTools.py/get_not_repeated_file_name