Created by: luotao1

related to #5344 (closed) : We can remove unused ProtoData in config_parser.py, and there are some related files which should be updated:

• test_config.conf in config_parser_test.py: use SimpleData to replace ProtoData
• chunking.conf in test_Trainer.cpp: can we remove this config since we should gen_proto_data in CMakeLists.txt.
• compare_sparse_data: forgot to delete in #5344 (closed)