If command.Execute() return err, print to stdErr

cmd/kube-proxy/proxy.go

@@ -18,6 +18,7 @@ package main
 
 import (
 	goflag "flag"
+	"fmt"
 	"os"
 
 	"github.com/spf13/pflag"
@@ -41,7 +42,8 @@ func main() {
 	logs.InitLogs()
 	defer logs.FlushLogs()
 
-	if err := command.Execute(); err != nil {
+	if err := command.Execute(); err != nil {		
+		fmt.Fprintf(os.Stderr, "%v\n", err)
 		os.Exit(1)
 	}
 }