Created by: lcy-seso

• This RR https://github.com/PaddlePaddle/Paddle/pull/2384 does not pass the unitest in CI system. Here is the log: https://travis-ci.org/PaddlePaddle/Paddle/jobs/239968732

• 12 unitest fails, but they are all successfully executed in my local environment.

• This PR modifies the config_parse.py. However, according to the following error information, the CI system uses the unmodified version of config_parser.py, leading to failures in unitest.

Traceback (most recent call last):
  File "test_rnn_layer.py", line 159, in test_sequence_rnn_multi_input
    diff = difflib.unified_diff(parse_old_rnn().splitlines(1),
  File "test_rnn_layer.py", line 122, in parse_old_rnn
    return str(parse_network(test))
  File "/home/travis/build/PaddlePaddle/Paddle/python/paddle/v2/tests/.test_env/lib/python2.7/site-packages/paddle/trainer_config_helpers/config_parser_utils.py", line 35, in parse_network_config
    config = config_parser.parse_config(network_conf, config_arg_str)
  File "/home/travis/build/PaddlePaddle/Paddle/python/paddle/v2/tests/.test_env/lib/python2.7/site-packages/paddle/trainer/config_parser.py", line 3567, in parse_config
    begin_parse(config_arg_str)
TypeError: begin_parse() takes no arguments (1 given)