govendor: Update 6 GCLOUD dependencies (#525)

* govendor: Update github.com/golang/protobuf

* govendor: Update github.com/gobwas/glob github.com/google/go-github

* govendor: Update 3 github.com/robertkrimen/otto

* govendor: Update 4 golang.org/x

golang.org/x/crypto
golang.org/x/net
golang.org/x/sys
golang.org/x/text
golang.org/x/time
golang.org/x/crypto

* govendor: Update 5 github.com/aws/aws-sdk-go

* govendor: Update 6 GCLOUD dependencies

vendor/google.golang.org/grpc/backoff.go

@@ -0,0 +1,38 @@
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * 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.
+ *
+ */
+
+// See internal/backoff package for the backoff implementation. This file is
+// kept for the exported types and API backward compatibility.
+
+package grpc
+
+import (
+	"time"
+)
+
+// DefaultBackoffConfig uses values specified for backoff in
+// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
+var DefaultBackoffConfig = BackoffConfig{
+	MaxDelay: 120 * time.Second,
+}
+
+// BackoffConfig defines the parameters for the default gRPC backoff strategy.
+type BackoffConfig struct {
+	// MaxDelay is the upper bound of backoff delay.
+	MaxDelay time.Duration
+}