func (tcs *TrafficControlStatus) SetLatency(latency string) {
	if latency == "" {
		tcs.latency = "-"
	}
	tcs.latency = latency
}
SetLatency sets the latency value
the convention is that empty latency is represented by '-'
package main
import (
	"encoding/json"
	"fmt"
	"net"
	"net/http"
	"os"
	"os/signal"
	"path/filepath"
	"syscall"
	log "github.com/Sirupsen/logrus"
)
type containerClient interface {
	Start()
}
type Plugin struct {
	reporter *Reporter
	clients []containerClient
}
type TrafficControlStatus struct {
	latency    string
	packetLoss string
}
func (tcs *TrafficControlStatus) String() string {
	return fmt.Sprintf("%s %s", tcs.latency, tcs.packetLoss)
}