Rotating binary/relay logs can cause interuption to the processing
on the server. Binary and relay logs have their own mechanism already
for not getting out of control (expire_logs_days).

By no longer rotating binary and relay logs log rotation is limited to
the following logs:
* error log
* general log
* slow query log

Writing these to the binary log would cause any logrotation on the
slave to occur twice, once due to this and another due to the log-
rotate script on the slave. Now --local is passed to mysqladmin to
prevent this duplication.