Replacing go log with cns log. (#262)

Author: jaer-tsun

telemetry/telemetry.go

@@ -10,7 +10,6 @@ import (
 	"encoding/xml"
 	"fmt"
 	"io"
-	"log"
 	"net"
 	"net/http"
 	"os"
@@ -19,6 +18,7 @@ import (
 	"strings"
 
 	"github.com/Azure/azure-container-networking/common"
+	"github.com/Azure/azure-container-networking/log"
 	"github.com/Azure/azure-container-networking/platform"
 )