Procfile: use proxy as default
Procfile: use proxy as default

I think it makes sense to make the proxy listen on the default port so
we can give the proxy more testing by default. Also, this should make it
easy to kill a single etcd member and test that etcdctl still works,
etc.

However, I have hit a bug: the proxy takes several seconds

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