Add missing -- when we run dockerinit from native

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
Upstream-commit: c987901f8d64ab2390409018074b2f93c1718e89
Component: engine

components/engine/execdriver/native/driver.go

@@ -246,6 +246,7 @@ func (d *dockerCommandFactory) Create(container *libcontainer.Container, console
 		"-console", console,
 		"-pipe", fmt.Sprint(syncFd),
 		"-root", filepath.Join(d.driver.root, d.c.ID),
+		"--",
 	}, args...)
 
 	// set this to nil so that when we set the clone flags anything else is reset