raft: remove wrong invariant
raft: remove wrong invariant

The commit > unstable might not true for follower. The leader only need
to ensure the entry is stored on the majority of nodes to commit an
entry. So the minority of the cluster might receive commit > unstable
append request. This is normal.

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