fix(dbmaster): keep binlog files for 2 days instead of 10

reducing storage requirements for busy systems

dbmaster/51-server.cnf

@@ -9,6 +9,6 @@ log_bin                 = /var/log/mysql/mysql-bin.log
 binlog_format=ROW
 log-basename=nsmaster
 binlog-do-db=pdns
-expire_logs_days        = 10
+expire_logs_days        = 2
 
 wait_timeout = 28800