test(zfspv): vendor for ginkgo test code

Signed-off-by: Pawan <pawan@mayadata.io>

vendor/github.com/hpcloud/tail/README.md

@@ -0,0 +1,28 @@
+[![Build Status](https://travis-ci.org/hpcloud/tail.svg)](https://travis-ci.org/hpcloud/tail)
+[![Build status](https://ci.appveyor.com/api/projects/status/kohpsf3rvhjhrox6?svg=true)](https://ci.appveyor.com/project/HelionCloudFoundry/tail) 
+
+# Go package for tail-ing files
+
+A Go package striving to emulate the features of the BSD `tail` program. 
+
+```Go
+t, err := tail.TailFile("/var/log/nginx.log", tail.Config{Follow: true})
+for line := range t.Lines {
+    fmt.Println(line.Text)
+}
+```
+
+See [API documentation](http://godoc.org/github.com/hpcloud/tail).
+
+## Log rotation
+
+Tail comes with full support for truncation/move detection as it is
+designed to work with log rotation tools.
+
+## Installing
+
+    go get github.com/hpcloud/tail/...
+
+## Windows support
+
+This package [needs assistance](https://github.com/hpcloud/tail/labels/Windows) for full Windows support.