fix update also return newValue
fix update also return newValue

vimalk78/etcd,pauldallen/etcd,chai2010/etcd,crandles/etcd,kingland/etcd,qqsun8819/etcd,joshix/etcd,Eagle-X/etcd,jefby/etcd,ecnahc515/etcd,HideoYamauchi/etcd,xebitstudios/etcd,devfreesg/etcd,jonboulle/etcd,cvik/etcd,fanminshi/etcd,ktateish/etcd,snailwalker/etcd,Timer/etcd,SivagnanamCiena/etcd,mischief/etcd,jravetch/etcd,insionng/etcd,bakins/etcd,tangkun75/etcd,sebschrader/etcd,jmptrader/etcd,lorneli/etcd,dannysauer/etcd,wantonsolutions/dinv-etcd,xueshanf/etcd,mkumatag/etcd,joshix/etcd,es-chow/etcd,tamird/etcd,QuantiumTechnology/etcd,buaazp/etcd,gityf/etcd,a-robinson/etcd,bluebreezecf/etcd,qqsun8819/etcd,QuantiumTechnology/etcd,raoofm/etcd,Eagle-X/etcd,mkumatag/etcd,fgbreel/etcd,onlyjob/etcd,combk8s/etcd,njucslqq/etcd,linuxcer/etcd,gtank/etcd,yudai/etcd,visheshnp/etcd,nieanan/etcd,achanda/etcd,fasaxc/etcd,wowsoso/etcd,plasticbox/etcd,spotify/etcd,mickep76/etcd,endocode/etcd,gae123/etcd,giantswarm/etcd,chai2010-playground/etcd,sayden/etcd,OyTao/etcd_learning,achanda/etcd,jlamillan/etcd,rchicoli/etcd,lumjjb/etcd,Yhgenomics/etcd,luxas/etcd,insionng/etcd,rnaveiras/etcd,axingblog/etcd,shafreeck/etcd,shafreeck/etcd,hpcloud/etcd,gyuho/etcd,xiang90/etcd,freeloop1114/etcd,msanterre/etcd,jefby/etcd,insequent/etcd,ylong/etcd,shakefu/etcd,freeloop1114/etcd,Yhgenomics/etcd,njucslqq/etcd,spacejam/etcd,delkyd/etcd,chai2010-playground/etcd,xdlinear/etcd,gyuho/etcd,gtank/etcd,bspline/etcd,sofuture/etcd,YuleiXiao/etcd,ktateish/etcd,tempbottle/etcd,insequent/etcd,yifan-gu/etcd,chai2010/etcd,etcd-io/etcd,elimisteve/etcd,OyTao/etcd_learning,yichengq/etcd,yifan-gu/etcd,onlyjob/etcd,buaazp/etcd,polvi/etcd,siddontang/etcd,hongchaodeng/etcd,rnaveiras/etcd,oscarrr110/etcd,gouyang/etcd,raoofm/etcd,njharman/etcd,jravetch/etcd,hroyrh/etcd,cockroachdb/etcd,wowsoso/etcd,cchamplin/etcd,xiang90/etcd,cchamplin/etcd,wfxiang08/etcd,jchauncey/etcd,StorReduce/etcd,westhood/etcd,barakmich/etcd,a-robinson/etcd,msanterre/etcd,spotify/etcd,yudai/etcd,mgoelzer/etcd-fork2,mqliang/etcd,wantonsolutions/dinv-etcd,olark/etcd,StorReduce/etcd,coreos/etcd,tamird/etcd,jeremyeder/etcd,SivagnanamCiena/etcd,li-ang/etcd,cvik/etcd,gosharplite/etcd,cockroachdb/etcd,iamqizhao/etcd,cvik/etcd,qiaochao911/etcd,plasticbox/etcd,bakins/etcd,olark/etcd,justintung/etcd,hroyrh/etcd,csuideal/etcd,justintung/etcd,vimalk78/etcd,dannysauer/etcd,tguangch/etcd,youxidev/etcd,betawaffle/etcd,rchicoli/etcd,Ulexus/etcd,mike-lerch/etcd,iamqizhao/etcd,handsomesun/etcd,improbable-io/etcd,spacejam/etcd,mitake/etcd,offscale/etcd,shawnps/etcd,glevand/coreos--etcd,nkhare/etcd,kingland/etcd,sayden/etcd,gae123/etcd,yyljlyy/etcd,li-ang/etcd,wfxiang08/etcd,kkaneda/etcd,ravigadde/etcd,mgoelzer/etcd-fork2,hongchaodeng/etcd,lzbgt/etcd,crandles/etcd,sebschrader/etcd,fgbreel/etcd,heyitsanthony/etcd,spotify/etcd,honeyqa/etcd,HideoYamauchi/etcd,mwitkow-io/etcd,yyljlyy/etcd,pengzj/etcd,xdlinear/etcd,swingbach/etcd,bdarnell/etcd,rnaveiras/etcd,purpleidea/etcd,devfreesg/etcd,svdata/etcd,glycerine/etcd,es-chow/etcd,steveeJ/etcd,xychu/etcd,nieanan/etcd,gosharplite/etcd,purpleidea/etcd,sinsharat/etcd,Timer/etcd,imzhulei/etcd,bdarnell/etcd,chenbaihu/etcd,junxu/etcd,ajityagaty/etcd,betawaffle/etcd,lumjjb/etcd,princeqjzh/etcd,nkhare/etcd,junxu/etcd,mwitkow/etcd,TheHippo/etcd,Ulexus/etcd,sebrandon1/etcd,fanminshi/etcd,gityf/etcd,tguangch/etcd,robszumski/etcd,endocode/etcd,mwitkow/etcd,coreos/etcd,pengzj/etcd,armstrongli/etcd,imzhulei/etcd,visheshnp/etcd,wantonsolutions/dinv-etcd,csuideal/etcd,snailwalker/etcd,glycerine/etcd,gouyang/etcd,delkyd/etcd,qiaochao911/etcd,jlamillan/etcd,cvik/etcd,mischief/etcd,nekto0n/etcd,fasaxc/etcd,ylong/etcd,asim/etcd,zaphod-concur/etcd,xychu/etcd,openedbox/etcd,YuleiXiao/etcd,improbable-io/etcd,sebrandon1/etcd,bspline/etcd,axingblog/etcd,mqliang/etcd,Ulexus/etcd,CrazyJvm/etcd,mitake/etcd,cognusion/etcd,pigfoot/etcd,ajityagaty/etcd,jchauncey/etcd,tempbottle/etcd,dalanlan/etcd,kkaneda/etcd,jmptrader/etcd,cognusion/etcd,pauldallen/etcd,mqliang/etcd,openedbox/etcd,asim/etcd,hzy001/etcd,zaphod-concur/etcd,xueshanf/etcd,hzy001/etcd,chenbaihu/etcd,chipironcin/etcd,offscale/etcd,shakefu/etcd,spotify/etcd,mickep76/etcd,elimisteve/etcd,etcd-io/etcd,Winslett/etcd,hongbinz/etcd,dnaeon/etcd,luxas/etcd,akauppi/etcd,svdata/etcd,TheHippo/etcd,lzbgt/etcd,glensc/etcd,etcd-io/etcd,glensc/etcd,ajityagaty/etcd,mkumatag/etcd,Ulexus/etcd,combk8s/etcd,jeremyeder/etcd,whuwxl/etcd,yichengq/etcd,chipironcin/etcd,linuxcer/etcd,steveeJ/etcd,youxidev/etcd,siddontang/etcd,mwitkow-io/etcd,nekto0n/etcd,heyitsanthony/etcd,honeyqa/etcd,shawnps/etcd,princeqjzh/etcd,bluebreezecf/etcd,fasaxc/etcd,sofuture/etcd,tangkun75/etcd,arthurcolle/etcd,dterei/etcd,barakmich/etcd,beni55/etcd,glevand/coreos--etcd,Winslett/etcd,giantswarm/etcd,CrazyJvm/etcd,njharman/etcd,handsomesun/etcd,ecnahc515/etcd,ravigadde/etcd,westhood/etcd,oscarrr110/etcd,dalanlan/etcd,mike-lerch/etcd,jonboulle/etcd,armstrongli/etcd,akauppi/etcd,sinsharat/etcd,dnaeon/etcd,hongbinz/etcd,beni55/etcd,xebitstudios/etcd,lorneli/etcd,dterei/etcd,swingbach/etcd,polvi/etcd,robszumski/etcd,arthurcolle/etcd,whuwxl/etcd,hpcloud/etcd