Initial delivery of metrics code (#81)

* Initial delivery of metrics code

* Fix build issues

* Fix build issue with go vet

vendor/golang.org/x/crypto/ssh/test/doc.go

@@ -1,7 +0,0 @@
-// Copyright 2012 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.
-
-// This package contains integration tests for the
-// golang.org/x/crypto/ssh package.
-package test // import "golang.org/x/crypto/ssh/test"