add vendoring with go dep

vendor/github.com/influxdata/influxdb/services/collectd/test_client/README.md

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+collectD Client
+============
+This directory contains code for generating collectd load.

vendor/github.com/influxdata/influxdb/services/collectd/test_client/client.go

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+package main
+
+import (
+	"collectd.org/api"
+	"collectd.org/network"
+
+	"context"
+	"flag"
+	"fmt"
+	"math/rand"
+	"os"
+	"strconv"
+	"time"
+)
+
+var nMeasurments = flag.Int("m", 1, "Number of measurements")
+var tagVariance = flag.Int("v", 1, "Number of values per tag. Client is fixed at one tag")
+var rate = flag.Int("r", 1, "Number of points per second")
+var total = flag.Int("t", -1, "Total number of points to send (default is no limit)")
+var host = flag.String("u", "127.0.0.1:25826", "Destination host in the form host:port")
+
+func main() {
+	flag.Parse()
+
+	conn, err := network.Dial(*host, network.ClientOptions{})
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	defer conn.Close()
+
+	rateLimiter := make(chan int, *rate)
+
+	go func() {
+		ticker := time.NewTicker(time.Second)
+		for {
+			select {
+			case <-ticker.C:
+				for i := 0; i < *rate; i++ {
+					rateLimiter <- i
+				}
+			}
+		}
+	}()
+
+	nSent := 0
+	for {
+		if nSent >= *total && *total > 0 {
+			break
+		}
+		<-rateLimiter
+
+		vl := api.ValueList{
+			Identifier: api.Identifier{
+				Host:   "tagvalue" + strconv.Itoa(int(rand.Int31n(int32(*tagVariance)))),
+				Plugin: "golang" + strconv.Itoa(int(rand.Int31n(int32(*nMeasurments)))),
+				Type:   "gauge",
+			},
+			Time:     time.Now(),
+			Interval: 10 * time.Second,
+			Values:   []api.Value{api.Gauge(42.0)},
+		}
+		ctx := context.TODO()
+		if err := conn.Write(ctx, &vl); err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+		conn.Flush()
+		nSent = nSent + 1
+	}
+
+	fmt.Println("Number of points sent:", nSent)
+}