Update go dependencies

vendor/cloud.google.com/go/compute/metadata/metadata_test.go

@@ -1,48 +0,0 @@
-// Copyright 2016 Google Inc. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package metadata
-
-import (
-	"os"
-	"sync"
-	"testing"
-)
-
-func TestOnGCE_Stress(t *testing.T) {
-	if testing.Short() {
-		t.Skip("skipping in -short mode")
-	}
-	var last bool
-	for i := 0; i < 100; i++ {
-		onGCEOnce = sync.Once{}
-
-		now := OnGCE()
-		if i > 0 && now != last {
-			t.Errorf("%d. changed from %v to %v", i, last, now)
-		}
-		last = now
-	}
-	t.Logf("OnGCE() = %v", last)
-}
-
-func TestOnGCE_Force(t *testing.T) {
-	onGCEOnce = sync.Once{}
-	old := os.Getenv(metadataHostEnv)
-	defer os.Setenv(metadataHostEnv, old)
-	os.Setenv(metadataHostEnv, "127.0.0.1")
-	if !OnGCE() {
-		t.Error("OnGCE() = false; want true")
-	}
-}