httpreplay: fix test for kokoro

In TestRemoveAndClear, create the client without auth to avoid
an oauth2 token-refresh error when running on kokoro.

Change-Id: Ibb86ec9cea5bcfb342cf63939ea4d2abad21d26f
Reviewed-on: https://code-review.googlesource.com/c/37430
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jean de Klerk <deklerk@google.com>
diff --git a/httpreplay/httpreplay_test.go b/httpreplay/httpreplay_test.go
index 2636136..199911a 100644
--- a/httpreplay/httpreplay_test.go
+++ b/httpreplay/httpreplay_test.go
@@ -261,9 +261,6 @@
 }
 
 func TestRemoveAndClear(t *testing.T) {
-	if testing.Short() {
-		t.Skip("Integration tests skipped in short mode")
-	}
 	// Disable logging for this test, since it generates a lot.
 	log.SetOutput(ioutil.Discard)
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
@@ -284,7 +281,7 @@
 	rec.RemoveRequestHeaders("Rem*")
 	rec.ClearQueryParams("c")
 	rec.RemoveQueryParams("r")
-	hc, err := rec.Client(ctx)
+	hc, err := rec.Client(ctx, option.WithoutAuthentication())
 	if err != nil {
 		t.Fatal(err)
 	}