add ghost_throttle_control_replicas_query #630
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Archery 目前没有支持主从关系，云服务一般有固定的帐号建立主从，且端口都为3306 ，通过此查询查到相应的从库，实现gh-ost throttle_control_replicas 参数关联到相应的从库实例
ghost_throttle_control_replicas_query = "SELECT host from information_schema.processlist where user = 'rsandbox';"