Implement max_binlog_files directive from Percona

Currently there's no way to prevent the huge size of binarylogs which are generated in a short period of time. In our case we use binlog for MASTER-SLAVE replication and a high traffic weekend filled up the diskspace in the master server.

Percona has implemented max_binlog_files directive which can be used to ensure the maximum disk usage of binarylogs with conjunction with max_binlog_size directive.

See more: https://www.percona.com/doc/percona-server/LATEST/flexibility/max_binlog_files.html