containerd build clean on Solaris (#203)

* containerd build clean on Solaris

Signed-off-by: Amit Krishnan <krish.amit@gmail.com>

* Vendor golang.org/x/sys

Signed-off-by: Amit Krishnan <krish.amit@gmail.com>

ctr/container.go

@@ -632,23 +632,3 @@ type stdio struct {
 	stdout string
 	stderr string
 }
-
-func createStdio() (s stdio, err error) {
-	tmp, err := ioutil.TempDir("", "ctr-")
-	if err != nil {
-		return s, err
-	}
-	// create fifo's for the process
-	for name, fd := range map[string]*string{
-		"stdin":  &s.stdin,
-		"stdout": &s.stdout,
-		"stderr": &s.stderr,
-	} {
-		path := filepath.Join(tmp, name)
-		if err := syscall.Mkfifo(path, 0755); err != nil && !os.IsExist(err) {
-			return s, err
-		}
-		*fd = path
-	}
-	return s, nil
-}