Remove windows code and simplify linux

Windows will not use containerd and its just unused code and unneed
complexity to keep it all around.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

ctr/container.go

@@ -621,3 +621,23 @@ 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
+}

ctr/container_unix.go

@@ -1,30 +0,0 @@
-// +build !windows
-
-package main
-
-import (
-	"io/ioutil"
-	"os"
-	"path/filepath"
-	"syscall"
-)
-
-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
-}

ctr/container_windows.go

@@ -1,6 +0,0 @@
-package main
-
-// TODO Windows: This will have a very different implementation
-func createStdio() (s stdio, err error) {
-	return stdio{}, nil
-}