Add basic fifo support for IO copy

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

worker.go

@@ -15,6 +15,8 @@ type StartTask struct {
 	Container  runtime.Container
 	Checkpoint string
 	IO         *runtime.IO
+	Stdout     string
+	Stderr     string
 	Err        chan error
 }
 
@@ -34,8 +36,7 @@ func (w *worker) Start() {
 	defer w.wg.Done()
 	for t := range w.s.tasks {
 		started := time.Now()
-		// start logging the container's stdio
-		l, err := w.s.log(t.Container.Path(), t.IO)
+		l, err := w.s.copyIO(t.Stdout, t.Stderr, t.IO)
 		if err != nil {
 			evt := NewEvent(DeleteEventType)
 			evt.ID = t.Container.ID()
@@ -43,7 +44,7 @@ func (w *worker) Start() {
 			t.Err <- err
 			continue
 		}
-		w.s.containers[t.Container.ID()].logger = l
+		w.s.containers[t.Container.ID()].copier = l
 		if t.Checkpoint != "" {
 			if err := t.Container.Restore(t.Checkpoint); err != nil {
 				evt := NewEvent(DeleteEventType)