Update shim for exec

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

supervisor/signal.go

@@ -5,20 +5,18 @@ type SignalEvent struct {
 }
 
 func (h *SignalEvent) Handle(e *Event) error {
-	/*
-		i, ok := h.s.containers[e.ID]
-		if !ok {
-			return ErrContainerNotFound
+	i, ok := h.s.containers[e.ID]
+	if !ok {
+		return ErrContainerNotFound
+	}
+	processes, err := i.container.Processes()
+	if err != nil {
+		return err
+	}
+	for _, p := range processes {
+		if p.ID() == e.Pid {
+			return p.Signal(e.Signal)
 		}
-			processes, err := i.container.Processes()
-			if err != nil {
-				return err
-			}
-			for _, p := range processes {
-				if pid, err := p.Pid(); err == nil && pid == e.Pid {
-					return p.Signal(e.Signal)
-				}
-			}
-	*/
+	}
 	return ErrProcessNotFound
 }