Wrap the unix token info in a unix_user_token in auth_serversupplied_info

No functional change, this is a preparation for more current_user ref removal
(This used to be commit dcaedf345e)

source3/lib/substitute.c

@@ -910,7 +910,7 @@ char *standard_sub_conn(TALLOC_CTX *ctx, connection_struct *conn, const char *st
 				lp_servicename(SNUM(conn)),
 				conn->server_info->unix_name,
 				conn->connectpath,
-				conn->server_info->gid,
+				conn->server_info->utok.gid,
 				get_smb_user_name(),
 				"",
 				str);