Fixes K8sNetworkPlumbingWG package capitalization

Migrates package to use capitalized name, also cleans up dependencies.

Signed-off-by: Tim Rozet <trozet@redhat.com>

vendor/google.golang.org/appengine/internal/identity_flex.go

@@ -0,0 +1,11 @@
+// Copyright 2018 Google LLC. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+// +build appenginevm
+
+package internal
+
+func init() {
+	appengineFlex = true
+}