Runtime: Delete corresponding devices when deleting container

runtime.go

@@ -282,6 +282,11 @@ func (runtime *Runtime) Destroy(container *Container) error {
 	if err := os.RemoveAll(container.root); err != nil {
 		return fmt.Errorf("Unable to remove filesystem for %v: %v", container.ID, err)
 	}
+	if runtime.GetMountMethod() == MountMethodDeviceMapper {
+		if err := runtime.deviceSet.RemoveDevice(container.ID); err != nil {
+			return fmt.Errorf("Unable to remove device for %v: %v", container.ID, err)
+		}
+	}
 	return nil
 }