Update vendor dependencies

vendor/google.golang.org/appengine/aetest/instance.go

@@ -3,6 +3,7 @@ package aetest
 import (
 	"io"
 	"net/http"
+	"time"
 
 	"golang.org/x/net/context"
 	"google.golang.org/appengine"
@@ -24,6 +25,12 @@ type Options struct {
 	// StronglyConsistentDatastore is whether the local datastore should be
 	// strongly consistent. This will diverge from production behaviour.
 	StronglyConsistentDatastore bool
+	// SuppressDevAppServerLog is whether the dev_appserver running in tests
+	// should output logs.
+	SuppressDevAppServerLog bool
+	// StartupTimeout is a duration to wait for instance startup.
+	// By default, 15 seconds.
+	StartupTimeout time.Duration
 }
 
 // NewContext starts an instance of the development API server, and returns