nsqd: fix stats data race
nsqd: fix stats data race

kesutton/nsq,bo406/nsq,yh453926638/nsq,mikeqian/nsq,philipbo/nsq,nsqio/nsq,chrislusf/nsq,jlr52/nsq,yh453926638/nsq,rpau/nsq,jlr52/nsq,handsomesun/nsq,ploxiln/nsq,coderhaoxin/nsq,mikeqian/nsq,mreiferson/nsq,ShinichR/nsq,sparklxb/nsq,bitly/nsq,mikeqian/nsq,Dieterbe/nsq,ShinichR/nsq,myhongkongzhen/nsq,mashuai/nsq,ploxiln/nsq,mashuai/nsq,beni55/nsq,wmydz1/nsq,handsomesun/nsq,myhongkongzhen/nsq,lcp0578/nsq,Dieterbe/nsq,mashuai/nsq,kevinc0825/nsq,Dieterbe/nsq,CrazyJvm/nsq,gaowenbin/nsq,chaosue/nsq,CrazyJvm/nsq,jmptrader/nsq,sparklxb/nsq,sparklxb/nsq,wuxu92/nsq,coderhaoxin/nsq,gaowenbin/nsq,sparklxb/nsq,myhongkongzhen/nsq,szqh97/nsq,w4ngyi/nsq,lcp0578/nsq,handsomesun/nsq,myhongkongzhen/nsq,chrislusf/nsq,msn217/nsq,yh453926638/nsq,jehiah/nsq,mreiferson/nsq,beni55/nsq,chaosue/nsq,youxidev/nsq,rpau/nsq,philipbo/nsq,myhongkongzhen/nsq,OlafRadicke/nsq,kesutton/nsq,yh453926638/nsq,bitly/nsq,jehiah/nsq,MadBomber/nsq,gaowenbin/nsq,xiexingguang/nsq,philipbo/nsq,xuzhaokui/nsq,qinlodestar/nsq,coderhaoxin/nsq,beni55/nsq,wmydz1/nsq,w4ngyi/nsq,nsqio/nsq,magastzheng/nsq,nieanan/nsq,wuxu92/nsq,CrazyJvm/nsq,absolute8511/nsq,szqh97/nsq,rpau/nsq,nsqio/nsq,kevinc0825/nsq,kesutton/nsq,wmydz1/nsq,mikedewar/nsq,handsomesun/nsq,szqh97/nsq,mikeqian/nsq,lcp0578/nsq,bo406/nsq,Dieterbe/nsq,chaosue/nsq,msn217/nsq,ShinichR/nsq,bo406/nsq,ploxiln/nsq,coderhaoxin/nsq,rpau/nsq,beni55/nsq,nieanan/nsq,philipbo/nsq,szqh97/nsq,jmptrader/nsq,jlr52/nsq,absolute8511/nsq,handsomesun/nsq,ShinichR/nsq,mikedewar/nsq,mikeqian/nsq,coderhaoxin/nsq,OlafRadicke/nsq,mreiferson/nsq,mikedewar/nsq,jehiah/nsq,qinlodestar/nsq,w4ngyi/nsq,wmydz1/nsq,msn217/nsq,bitly/nsq,szqh97/nsq,jehiah/nsq,rpau/nsq,MadBomber/nsq,moander/nsq,MadBomber/nsq,gaowenbin/nsq,mashuai/nsq,qinlodestar/nsq,bo406/nsq,magastzheng/nsq,xiexingguang/nsq,xuzhaokui/nsq,MadBomber/nsq,CrazyJvm/nsq,chaosue/nsq,w4ngyi/nsq,xiexingguang/nsq,jlr52/nsq,absolute8511/nsq,MadBomber/nsq,ploxiln/nsq,absolute8511/nsq,beni55/nsq,bitly/nsq,jmptrader/nsq,OlafRadicke/nsq,gaowenbin/nsq,mreiferson/nsq,moander/nsq,kesutton/nsq,chaosue/nsq,msn217/nsq,yh453926638/nsq,wmydz1/nsq,xiexingguang/nsq,jlr52/nsq,ShinichR/nsq,mashuai/nsq,xiexingguang/nsq,xuzhaokui/nsq,ploxiln/nsq,wuxu92/nsq,kevinc0825/nsq,absolute8511/nsq,nieanan/nsq,lcp0578/nsq,bitly/nsq,youxidev/nsq,philipbo/nsq,nsqio/nsq,nsqio/nsq,chrislusf/nsq,qinlodestar/nsq,moander/nsq,w4ngyi/nsq,CrazyJvm/nsq,lcp0578/nsq,sparklxb/nsq,youxidev/nsq,mreiferson/nsq,magastzheng/nsq,bo406/nsq,msn217/nsq,jehiah/nsq,qinlodestar/nsq,Dieterbe/nsq,kesutton/nsq