post_complete_message_to_sweep_process in main_fedavg.py is useless.

[JLU-Neal]

In experiments/distributed/moleculenet/main_fedavg.py, several lines of codes at the end of the file are shown as follows:

if process_id == 0:
        post_complete_message_to_sweep_process(args)

Actually, these two lines of codes cannot be run, since before getting into them the application will call MPI_Abort to terminate the processes.