Allow tuning the number of worker threads or using OIO.
Allow tuning the number of worker threads or using OIO.

Signed-off-by: Benoit Sigoure <d0ba46810740e35622837d76cd77ceb8c4bf46f5@gmail.com>

kidaa/opentsdb,johann8384/opentsdb,MadDogTechnology/opentsdb,sidhhu/opentsdb,alienth/opentsdb,OpenTSDB/opentsdb,andyflury/opentsdb,eswdd/opentsdb,OpenTSDB/opentsdb,andyflury/opentsdb,OpenTSDB/opentsdb,johann8384/opentsdb,eswdd/opentsdb,sidhhu/opentsdb,kidaa/opentsdb,MadDogTechnology/opentsdb,alienth/opentsdb,ShefronYudy/opentsdb,ShefronYudy/opentsdb,MadDogTechnology/opentsdb