etcdserver: better version detection log output
etcdserver: better version detection log output

Fix https://github.com/coreos/etcd/issues/3288

mike-lerch/etcd,Eagle-X/etcd,zaphod-concur/etcd,hongchaodeng/etcd,mickep76/etcd,ajityagaty/etcd,jeremyeder/etcd,rnaveiras/etcd,lumjjb/etcd,a-robinson/etcd,lorneli/etcd,swingbach/etcd,mkumatag/etcd,gouyang/etcd,ktateish/etcd,combk8s/etcd,purpleidea/etcd,joshix/etcd,li-ang/etcd,handsomesun/etcd,mqliang/etcd,hongbinz/etcd,etcd-io/etcd,jefby/etcd,SivagnanamCiena/etcd,sebschrader/etcd,TheHippo/etcd,lzbgt/etcd,insequent/etcd,CrazyJvm/etcd,etcd-io/etcd,purpleidea/etcd,glevand/coreos--etcd,siddontang/etcd,fanminshi/etcd,kkaneda/etcd,freeloop1114/etcd,mqliang/etcd,raoofm/etcd,jonboulle/etcd,swingbach/etcd,gityf/etcd,akauppi/etcd,bdarnell/etcd,siddontang/etcd,imzhulei/etcd,yyljlyy/etcd,fgbreel/etcd,visheshnp/etcd,HideoYamauchi/etcd,insionng/etcd,heyitsanthony/etcd,tguangch/etcd,Winslett/etcd,dnaeon/etcd,buaazp/etcd,elimisteve/etcd,wantonsolutions/dinv-etcd,steveeJ/etcd,elimisteve/etcd,endocode/etcd,yichengq/etcd,TheHippo/etcd,zaphod-concur/etcd,SivagnanamCiena/etcd,svdata/etcd,sofuture/etcd,sebschrader/etcd,ajityagaty/etcd,jlamillan/etcd,chipironcin/etcd,joshix/etcd,lumjjb/etcd,armstrongli/etcd,jchauncey/etcd,steveeJ/etcd,mkumatag/etcd,handsomesun/etcd,wantonsolutions/dinv-etcd,msanterre/etcd,gae123/etcd,rnaveiras/etcd,buaazp/etcd,li-ang/etcd,shakefu/etcd,openedbox/etcd,openedbox/etcd,kkaneda/etcd,tamird/etcd,dalanlan/etcd,ktateish/etcd,hongchaodeng/etcd,StorReduce/etcd,bluebreezecf/etcd,dannysauer/etcd,achanda/etcd,yichengq/etcd,chenbaihu/etcd,fasaxc/etcd,snailwalker/etcd,arthurcolle/etcd,vimalk78/etcd,endocode/etcd,oscarrr110/etcd,heyitsanthony/etcd,OyTao/etcd_learning,jefby/etcd,sinsharat/etcd,cockroachdb/etcd,fasaxc/etcd,xiang90/etcd,yyljlyy/etcd,tempbottle/etcd,pauldallen/etcd,honeyqa/etcd,ravigadde/etcd,whuwxl/etcd,rchicoli/etcd,hroyrh/etcd,fasaxc/etcd,achanda/etcd,msanterre/etcd,imzhulei/etcd,cognusion/etcd,improbable-io/etcd,mkumatag/etcd,beni55/etcd,asim/etcd,HideoYamauchi/etcd,xdlinear/etcd,StorReduce/etcd,arthurcolle/etcd,sayden/etcd,jlamillan/etcd,honeyqa/etcd,westhood/etcd,iamqizhao/etcd,combk8s/etcd,sofuture/etcd,xiang90/etcd,linuxcer/etcd,giantswarm/etcd,svdata/etcd,cchamplin/etcd,Eagle-X/etcd,spacejam/etcd,visheshnp/etcd,YuleiXiao/etcd,Timer/etcd,yudai/etcd,gityf/etcd,ajityagaty/etcd,insionng/etcd,tamird/etcd,asim/etcd,plasticbox/etcd,lzbgt/etcd,glycerine/etcd,onlyjob/etcd,bdarnell/etcd,luxas/etcd,glevand/coreos--etcd,freeloop1114/etcd,Yhgenomics/etcd,wowsoso/etcd,wowsoso/etcd,pauldallen/etcd,rnaveiras/etcd,sinsharat/etcd,Yhgenomics/etcd,gyuho/etcd,xychu/etcd,nekto0n/etcd,onlyjob/etcd,tguangch/etcd,OyTao/etcd_learning,dnaeon/etcd,glycerine/etcd,njucslqq/etcd,spacejam/etcd,whuwxl/etcd,hroyrh/etcd,raoofm/etcd,nekto0n/etcd,gouyang/etcd,gyuho/etcd,bluebreezecf/etcd,gae123/etcd,qqsun8819/etcd,jchauncey/etcd,oscarrr110/etcd,delkyd/etcd,yudai/etcd,shakefu/etcd,mike-lerch/etcd,vimalk78/etcd,mickep76/etcd,linuxcer/etcd,sebrandon1/etcd,plasticbox/etcd,xdlinear/etcd,sebrandon1/etcd,fanminshi/etcd,luxas/etcd,iamqizhao/etcd,insequent/etcd,a-robinson/etcd,betawaffle/etcd,CrazyJvm/etcd,coreos/etcd,hongbinz/etcd,chipironcin/etcd,giantswarm/etcd,YuleiXiao/etcd,cockroachdb/etcd,mqliang/etcd,jonboulle/etcd,armstrongli/etcd,tempbottle/etcd,westhood/etcd,snailwalker/etcd,rchicoli/etcd,betawaffle/etcd,qqsun8819/etcd,shawnps/etcd,coreos/etcd,improbable-io/etcd,cchamplin/etcd,sayden/etcd,jeremyeder/etcd,delkyd/etcd,Winslett/etcd,dannysauer/etcd,beni55/etcd,dalanlan/etcd,wantonsolutions/dinv-etcd,etcd-io/etcd,akauppi/etcd,ravigadde/etcd,cognusion/etcd,chenbaihu/etcd,xychu/etcd,Timer/etcd,fgbreel/etcd,shawnps/etcd,lorneli/etcd,njucslqq/etcd