Floodlight API Api Look-Ahead-rl 流量功能 /wm/core/switch/all/flow/json上每个流的数据格式： "priority": "1", "hard_timeout_s": "0", "byte_count": "294", "idle_timeout_s": "5", "duration_nsec": "608000000", "packet_count": "3", "duration_sec": "3", "version": "OF_