optimize
add new functions to besdirac-dms-dataset-get
Use rsync for dataset get

Signed-off-by: Zhao Xianghu <zhaoxh@ihep.ac.cn>
Merge remote-tracking branch 'zhangg/master' into test_merge

Signed-off-by: Zhao Xianghu <zhaoxh@ihep.ac.cn>

Conflicts:
	Badger/scripts/besdirac-dms-dataset-get.py