Fix tty set issue for ioctl error

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)

container.go

@@ -329,6 +329,7 @@ func (container *Container) startPty() error {
 	// stdin
 	if container.Config.OpenStdin {
 		container.process.Stdin = ptySlave
+		container.process.SysProcAttr.Setctty = true
 		go func() {
 			defer container.stdin.Close()
 			utils.Debugf("startPty: begin of stdin pipe")

execdriver/lxc/driver.go

@@ -81,7 +81,6 @@ func (d *driver) Start(c *execdriver.Process) error {
 	c.Args = append([]string{name}, arg...)
 
 	c.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
-	c.SysProcAttr.Setctty = true
 
 	if err := c.Start(); err != nil {
 		return err