mod_muc: Import util.stanza into the config handler modules that need it. Fixes #432.

plugins/muc/lock.lib.lua

@@ -7,6 +7,8 @@
 -- COPYING file in the source package for more information.
 --
 
+local st = require "util.stanza";
+
 local lock_rooms = module:get_option_boolean("muc_room_locking", false);
 local lock_room_timeout = module:get_option_number("muc_room_lock_timeout", 300);
 

plugins/muc/members_only.lib.lua

@@ -7,6 +7,8 @@
 -- COPYING file in the source package for more information.
 --
 
+local st = require "util.stanza";
+
 local muc_util = module:require "muc/util";
 local valid_roles, valid_affiliations = muc_util.valid_roles, muc_util.valid_affiliations;
 

plugins/muc/password.lib.lua

@@ -7,6 +7,8 @@
 -- COPYING file in the source package for more information.
 --
 
+local st = require "util.stanza";
+
 local function get_password(room)
 	return room._data.password;
 end