Fix lint errors

examples/customization/external-auth-headers/nginx/authsvc/authsvc.go

@@ -2,10 +2,10 @@ package main
 
 import (
 	"fmt"
-	"net/http"
-	"strings"
 	"math/rand"
+	"net/http"
 	"strconv"
+	"strings"
 )
 
 // Sample authentication service returning several HTTP headers in response

examples/customization/external-auth-headers/nginx/echosvc/echosvc.go

@@ -6,7 +6,8 @@ import (
 )
 
 func handler(w http.ResponseWriter, r *http.Request) {
-	fmt.Fprintf(w, "UserID: %s, UserRole: %s", r.Header.Get("UserID"), r.Header.Get("UserRole"))}
+	fmt.Fprintf(w, "UserID: %s, UserRole: %s", r.Header.Get("UserID"), r.Header.Get("UserRole"))
+}
 
 // Sample  "echo" service displaying UserID and UserRole HTTP request headers
 func main() {