Update vendor directory

Re-added cobra patch 499475bb41

vendor/golang.org/x/crypto/ssh/tcpip_test.go

@@ -1,20 +0,0 @@
-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"testing"
-)
-
-func TestAutoPortListenBroken(t *testing.T) {
-	broken := "SSH-2.0-OpenSSH_5.9hh11"
-	works := "SSH-2.0-OpenSSH_6.1"
-	if !isBrokenOpenSSHVersion(broken) {
-		t.Errorf("version %q not marked as broken", broken)
-	}
-	if isBrokenOpenSSHVersion(works) {
-		t.Errorf("version %q marked as broken", works)
-	}
-}