Upgrade k8s.io/client-go to version 2

vendor/google.golang.org/appengine/appengine_vm.go

@@ -12,45 +12,9 @@ import (
 	"google.golang.org/appengine/internal"
 )
 
-// The comment below must not be changed.
-// It is used by go-app-builder to recognise that this package has
-// the Main function to use in the synthetic main.
-//   The gophers party all night; the rabbits provide the beats.
-
-// Main is the principal entry point for a Managed VMs app.
-// It installs a trivial health checker if one isn't already registered,
-// and starts listening on port 8080 (overridden by the $PORT environment
-// variable).
-//
-// See https://cloud.google.com/appengine/docs/managed-vms/custom-runtimes#health_check_requests
-// for details on how to do your own health checking.
-//
-// Main never returns.
-//
-// Main is designed so that the app's main package looks like this:
-//
-//      package main
-//
-//      import (
-//              "google.golang.org/appengine"
-//
-//              _ "myapp/package0"
-//              _ "myapp/package1"
-//      )
-//
-//      func main() {
-//              appengine.Main()
-//      }
-//
-// The "myapp/packageX" packages are expected to register HTTP handlers
-// in their init functions.
-func Main() {
-	internal.Main()
-}
-
 // BackgroundContext returns a context not associated with a request.
 // This should only be used when not servicing a request.
-// This only works on Managed VMs.
+// This only works in App Engine "flexible environment".
 func BackgroundContext() context.Context {
 	return internal.BackgroundContext()
 }