nsqd: fix race when get/set client metadata (test flakiness)
nsqd: fix race when get/set client metadata (test flakiness)

jehiah/nsq,judwhite/nsq-0.3.2-win,lcp0578/nsq,beni55/nsq,pombredanne/nsq,Dieterbe/nsq,myhongkongzhen/nsq,ploxiln/nsq,19hz/nsq,ploxiln/nsq,jehiah/nsq,yh453926638/nsq,handsomesun/nsq,CrazyJvm/nsq,w4ngyi/nsq,svmehta/nsq,msn217/nsq,youxidev/nsq,wmydz1/nsq,CrazyJvm/nsq,jlr52/nsq,qinlodestar/nsq,MadBomber/nsq,beni55/nsq,CrazyJvm/nsq,moander/nsq,rpau/nsq,lcp0578/nsq,wmydz1/nsq,propellerads/nsq,mashuai/nsq,szqh97/nsq,bo406/nsq,ShinichR/nsq,qinlodestar/nsq,19hz/nsq,bo406/nsq,jlr52/nsq,mikedewar/nsq,sparklxb/nsq,msn217/nsq,xuzhaokui/nsq,ShinichR/nsq,xiexingguang/nsq,propellerads/nsq,lcp0578/nsq,bo406/nsq,coderhaoxin/nsq,ploxiln/nsq,ShinichR/nsq,shanemhansen/nsq,chaosue/nsq,svmehta/nsq,gaowenbin/nsq,gaowenbin/nsq,xuzhaokui/nsq,propellerads/nsq,wmydz1/nsq,jmptrader/nsq,chaosue/nsq,bitly/nsq,beni55/nsq,youxidev/nsq,kesutton/nsq,szqh97/nsq,chrisroberts/nsq,handsomesun/nsq,mreiferson/nsq,kesutton/nsq,qinlodestar/nsq,mikeqian/nsq,myhongkongzhen/nsq,handsomesun/nsq,w4ngyi/nsq,mreiferson/nsq,seanluo/nsq_with_note,qinlodestar/nsq,jmptrader/nsq,yh453926638/nsq,chrislusf/nsq,wuxu92/nsq,tophymastery/nsq,seanluo/nsq_with_note,xuzhaokui/nsq,kevinc0825/nsq,bitly/nsq,sparklxb/nsq,kesutton/nsq,nsqio/nsq,elubow/nsq,coderhaoxin/nsq,nieanan/nsq,w4ngyi/nsq,coderhaoxin/nsq,ShinichR/nsq,rpau/nsq,MadBomber/nsq,tophymastery/nsq,sparklxb/nsq,sparklxb/nsq,Dieterbe/nsq,yh453926638/nsq,lytics/nsq,ploxiln/nsq,absolute8511/nsq,Dieterbe/nsq,judwhite/nsq-0.3.2-win,kesutton/nsq,jehiah/nsq,mreiferson/nsq,ShinichR/nsq,nsqio/nsq,chrislusf/nsq,elubow/nsq,bitly/nsq,menghan/nsq,msn217/nsq,qinlodestar/nsq,xiexingguang/nsq,nieanan/nsq,mreiferson/nsq,mikeqian/nsq,msn217/nsq,myhongkongzhen/nsq,judwhite/nsq-0.3.2-win,w4ngyi/nsq,yh453926638/nsq,youxidev/nsq,bitly/nsq,CrazyJvm/nsq,philipbo/nsq,rpau/nsq,xiexingguang/nsq,19hz/nsq,Dieterbe/nsq,MadBomber/nsq,yh453926638/nsq,szqh97/nsq,mikedewar/nsq,coderhaoxin/nsq,bo406/nsq,sparklxb/nsq,kevinc0825/nsq,moander/nsq,jehiah/nsq,MadBomber/nsq,mashuai/nsq,beni55/nsq,szqh97/nsq,wuxu92/nsq,chrislusf/nsq,coderhaoxin/nsq,gaowenbin/nsq,jlr52/nsq,chaosue/nsq,kesutton/nsq,nieanan/nsq,beni55/nsq,lcp0578/nsq,menghan/nsq,OlafRadicke/nsq,myhongkongzhen/nsq,nsqio/nsq,xiexingguang/nsq,chaosue/nsq,bitly/nsq,myhongkongzhen/nsq,nsqio/nsq,mikedewar/nsq,ploxiln/nsq,absolute8511/nsq,w4ngyi/nsq,msn217/nsq,szqh97/nsq,moander/nsq,chaosue/nsq,OlafRadicke/nsq,gaowenbin/nsq,wuxu92/nsq,magastzheng/nsq,mikeqian/nsq,gaowenbin/nsq,jlr52/nsq,Dieterbe/nsq,absolute8511/nsq,absolute8511/nsq,magastzheng/nsq,jlr52/nsq,nsqio/nsq,philipbo/nsq,handsomesun/nsq,magastzheng/nsq,mikeqian/nsq,jmptrader/nsq,absolute8511/nsq,mikeqian/nsq,mreiferson/nsq,jehiah/nsq,philipbo/nsq,CrazyJvm/nsq,mashuai/nsq,mashuai/nsq,MadBomber/nsq,handsomesun/nsq,mashuai/nsq,lytics/nsq,wmydz1/nsq,philipbo/nsq,chrisroberts/nsq,wmydz1/nsq,shanemhansen/nsq,jsocol/nsq,kevinc0825/nsq,OlafRadicke/nsq,jsocol/nsq,lcp0578/nsq,rpau/nsq,rpau/nsq,xiexingguang/nsq,philipbo/nsq,bo406/nsq,pombredanne/nsq