aurora - log rotation

Delete logs on rotation to save storage and avoid performance issues due to large log files

• 15% of the size of DB instance is only allowed for the log files
• Log rotation are done every hour
• Logs older than 30 days are deleted or the oldest log file
• audit, general and slow query logs are deleted 24 hours / threshold exceeded
• if log_output is set to TABLE, then the table is truncated