node.go: fix defer and add doc
node.go: fix defer and add doc

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