Added config value for max number of rows to be returned per Scanner round trip
Added config value for max number of rows to be returned per Scanner round trip

OpenTSDB/opentsdb,MadDogTechnology/opentsdb,MadDogTechnology/opentsdb,alienth/opentsdb,alienth/opentsdb,MadDogTechnology/opentsdb,OpenTSDB/opentsdb,OpenTSDB/opentsdb