Refactor user_joined handler

bigbluebutton-html5/imports/api/users/server/eventHandlers.js

@@ -4,8 +4,10 @@ import handleRemoveUser from './handlers/removeUser';
 import handlePresenterAssigned from './handlers/presenterAssigned';
 import handleEmojiStatus from './handlers/emojiStatus';
 import handleLockedStatusChange from './handlers/lockedStatusChange';
+import handleUserJoined from './handlers/userJoined';
 
 RedisPubSub.on('get_users_reply', handleGetUsers);
+RedisPubSub.on('user_joined_message', handleUserJoined);
 RedisPubSub.on('user_eject_from_meeting', handleRemoveUser);
 RedisPubSub.on('disconnect_user_message', handleRemoveUser);
 RedisPubSub.on('user_left_message', handleRemoveUser);