lxc-start-ephemeral: Wipe the whole container on exit, not just the rootfs

src/lxc/lxc-start-ephemeral.in

@@ -218,7 +218,7 @@ if not args.keep_data:
         os.fchmod(fd.fileno(), 0o755)
         fd.write("""#!/bin/sh
 [ -d "%s" ] && rm -Rf "%s"
-""" % (dest.get_config_item("lxc.rootfs"), dest.get_config_item("lxc.rootfs")))
+""" % (dest_path, dest_path))
 
     dest.set_config_item("lxc.hook.post-stop",
                             os.path.join(dest_path, "post-stop"))