Improve xmap_reader_mp by adding a flush thread.

Add seqbin data parser to adapt to internal 1w data training.

1. Refine data_utils/data.py to read bytes from tar file
2. Add scripts to submit paddle cloud job for ds2 trainning

1. Improve audio featurizer.
2. Add shift augmentor.
3. Update default argument to be the current best seggestion.
4. Add checkpoints with pass id.