nsqd: add benchmark for multiple topics
nsqd: add benchmark for multiple topics

jehiah/nsq,sparklxb/nsq,ploxiln/nsq,jehiah/nsq,sparklxb/nsq,bitly/nsq,sparklxb/nsq,ploxiln/nsq,ploxiln/nsq,rpau/nsq,bitly/nsq,bitly/nsq,bitly/nsq,nsqio/nsq,rpau/nsq,jlr52/nsq,sparklxb/nsq,rpau/nsq,jlr52/nsq,mreiferson/nsq,ploxiln/nsq,mreiferson/nsq,nsqio/nsq,bitly/nsq,jehiah/nsq,sparklxb/nsq,mreiferson/nsq,ploxiln/nsq,jlr52/nsq,jehiah/nsq,rpau/nsq,jlr52/nsq,nsqio/nsq,jlr52/nsq,mreiferson/nsq,nsqio/nsq,rpau/nsq,mreiferson/nsq,nsqio/nsq,jehiah/nsq