Update lxc with libcontainer SetupUser change

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

daemon/execdriver/lxc/lxc_init_linux.go

@@ -2,6 +2,8 @@ package lxc
 
 import (
 	"fmt"
+
+	"github.com/docker/libcontainer"
 	"github.com/docker/libcontainer/namespaces"
 	"github.com/docker/libcontainer/utils"
 )
@@ -10,14 +12,13 @@ func finalizeNamespace(args *InitArgs) error {
 	if err := utils.CloseExecFrom(3); err != nil {
 		return err
 	}
-
-	if err := namespaces.SetupUser(args.User); err != nil {
+	if err := namespaces.SetupUser(&libcontainer.Config{
+		User: args.User,
+	}); err != nil {
 		return fmt.Errorf("setup user %s", err)
 	}
-
 	if err := setupWorkingDirectory(args); err != nil {
 		return err
 	}
-
 	return nil
 }