[Warning] mysql.user table is not updated to new password format; Disabling new password usage until mysql_fix_privilege_tables is run

権限テーブルのアップグレードをしなさい！という警告

[対応方法]
mysqlが稼動している状態で↓

 $ mysql_fix_privilege_tables --password=root_password
This script updates all the mysql privilege tables to be usable by
MySQL 4.0 and above.

This is needed if you want to use the new GRANT functions,
CREATE AGGREGATE FUNCTION, or the more secure passwords in 4.1

done

[参考]
http://dev.mysql.com/doc/refman/4.1/ja/upgrading-grant-tables.html