rm fb_train.py (#432)

fb_train.py

-# Copyright (c) 2017-present, Facebook, Inc.
-# All rights reserved.
-#
-# This source code is licensed under the license found in the LICENSE file in
-# the root directory of this source tree. An additional grant of patent rights
-# can be found in the PATENTS file in the same directory.
-
-import torch.fb.rendezvous.zeus  # noqa: F401
-
-from fairseq import options
-
-from train import main
-
-
-if __name__ == '__main__':
-    parser = options.get_training_parser()
-    args = options.parse_args_and_arch(parser)
-    main(args)