cgroups: switch to lxc.payload as default pattern

configure.ac

@@ -483,7 +483,7 @@ AC_ARG_WITH([cgroup-pattern],
 	[AC_HELP_STRING(
 		[--with-cgroup-pattern=pattern],
 		[pattern for container cgroups]
-	)], [], [with_cgroup_pattern=['lxc/%n']])
+	)], [], [with_cgroup_pattern=['lxc.payload/%n']])
 
 # The path for the apparmor_parser's cache for generated apparmor profiles
 AC_ARG_WITH([apparmor-cache-dir],

src/lxc/initutils.c

@@ -101,7 +101,7 @@ const char *lxc_global_config_value(const char *option_name)
 		sprintf(user_config_path, "%s/.config/lxc/lxc.conf", user_home);
 		sprintf(user_default_config_path, "%s/.config/lxc/default.conf", user_home);
 		sprintf(user_lxc_path, "%s/.local/share/lxc/", user_home);
-		user_cgroup_pattern = strdup("lxc/%n");
+		user_cgroup_pattern = strdup("lxc.payload/%n");
 	}
 	else {
 		user_config_path = strdup(LXC_GLOBAL_CONF);