Feature: Separate script to run a binlog server out of existing binary logs from backups.

[dotmanila]

Similar to https://blueprints.launchpad.net/percona-server/+spec/standalone-binlog-server

[dotmanila]

• Similar to mysqlfrm, detect presence of mysqld or passed from config/command line
• Do not use any my.cnf, use sane defaults instead - initialize tmp data directory
• Collect binary logs files list into binlog index - set root user password and do not expose it
• Create pyxbackup user with replication client privs - this is to protect the binlogs from accidental PURGE BINARY LOGS
• Make sure expire_logs_days is set to 0
• Display port, user, password, socket, binlogs information when mysqld instance is up and running.