Use log_error/datadir from database settings instead of default variable (#478)

Signed-off-by: 123quhiwiwk <[email protected]>

roles/mysql_hardening/vars/Oracle Linux.yml

@@ -4,6 +4,4 @@ mysql_daemon: mysqld
 mysql_hardening_mysql_conf_file: '/etc/my.cnf'
 mysql_hardening_mysql_confd_dir: '/etc/my.cnf.d'
 
-mysql_hardening_log_file: '/var/log/mysqld.log'
-
 mysql_hardening_group: 'adm'