Update vendor directory

Re-added cobra patch 499475bb41

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

@@ -48,6 +48,7 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/stats"
 	"google.golang.org/grpc/tap"
 )
 
@@ -357,9 +358,10 @@ const (
 
 // ServerConfig consists of all the configurations to establish a server transport.
 type ServerConfig struct {
-	MaxStreams  uint32
-	AuthInfo    credentials.AuthInfo
-	InTapHandle tap.ServerInHandle
+	MaxStreams   uint32
+	AuthInfo     credentials.AuthInfo
+	InTapHandle  tap.ServerInHandle
+	StatsHandler stats.Handler
 }
 
 // NewServerTransport creates a ServerTransport with conn or non-nil error
@@ -372,6 +374,9 @@ func NewServerTransport(protocol string, conn net.Conn, config *ServerConfig) (S
 type ConnectOptions struct {
 	// UserAgent is the application user agent.
 	UserAgent string
+	// Authority is the :authority pseudo-header to use. This field has no effect if
+	// TransportCredentials is set.
+	Authority string
 	// Dialer specifies how to dial a network address.
 	Dialer func(context.Context, string) (net.Conn, error)
 	// FailOnNonTempDialError specifies if gRPC fails on non-temporary dial errors.
@@ -380,6 +385,8 @@ type ConnectOptions struct {
 	PerRPCCredentials []credentials.PerRPCCredentials
 	// TransportCredentials stores the Authenticator required to setup a client connection.
 	TransportCredentials credentials.TransportCredentials
+	// StatsHandler stores the handler for stats.
+	StatsHandler stats.Handler
 }
 
 // TargetInfo contains the information of the target such as network address and metadata.