tests: stabilize test_batch_snapshot (#3544)
tests: stabilize test_batch_snapshot (#3544)

Signed-off-by: Neil Shen <cce998fdf3749d1bb26a297634a107d1dc0875fa@gmail.com>
pingcap/tikv,BusyJay/tikv,BusyJay/tikv,pingcap/tikv,BusyJay/tikv,BusyJay/tikv,c4pt0r/tikv