Change the default values of write_out_draw_game_in_training_data_generation, use_draw_games_in_training and use_draw_games_in_validation

[nodchip]

It is believed that setting write_out_draw_game_in_training_data_generation, use_draw_games_in_training and use_draw_games_in_validation to 1 are better than 0. We will change the default values of write_out_draw_game_in_training_data_generation, use_draw_games_in_training and use_draw_games_in_validation. Before we change them, we need the following experiments:

1. Generate training data with write_out_draw_game_in_training_data_generation = 0.
2. Train a net with 1., use_draw_games_in_training = 0 and use_draw_games_in_validation = 0.
3. Generate training data with write_out_draw_game_in_training_data_generation = 1.
4. Train a net with 3., use_draw_games_in_training = 1 and use_draw_games_in_validation = 1.
5. Compare the elo between 2. and 4.

Any helps are welcome.