bugfixing: add PIPELINE_SETUP_OVERWRITE
bugfixing: add PIPELINE_SETUP_OVERWRITE

Add PIPELINE_SETUP_OVERWRITE and PIPELINE_SETUP_SEEK to
hadoop-hdfs/src/main/proto/datatransfer.proto

songweijia/hdfsrs,songweijia/hdfsrs,songweijia/hdfsrs,songweijia/hdfsrs,songweijia/hdfsrs,songweijia/hdfsrs,songweijia/hdfsrs,songweijia/hdfsrs