bridge: fix command line flag handling
bridge: fix command line flag handling

flag package expects flags in Argv[1:] and stops on non-flag arguments
but bridge was expecting the forwarding address in os.Argv[1]

StorReduce/etcd,linuxcer/etcd,jlamillan/etcd,dnaeon/etcd,coreos/etcd,whuwxl/etcd,joshix/etcd,wantonsolutions/dinv-etcd,glycerine/etcd,endocode/etcd,glevand/coreos--etcd,akauppi/etcd,YuleiXiao/etcd,wantonsolutions/dinv-etcd,akauppi/etcd,mkumatag/etcd,mickep76/etcd,etcd-io/etcd,ktateish/etcd,plasticbox/etcd,a-robinson/etcd,mqliang/etcd,insequent/etcd,wantonsolutions/dinv-etcd,qqsun8819/etcd,coreos/etcd,nekto0n/etcd,sofuture/etcd,lumjjb/etcd,sinsharat/etcd,handsomesun/etcd,lorneli/etcd,ajityagaty/etcd,OyTao/etcd_learning,hongchaodeng/etcd,mkumatag/etcd,chipironcin/etcd,nekto0n/etcd,li-ang/etcd,armstrongli/etcd,heyitsanthony/etcd,linuxcer/etcd,heyitsanthony/etcd,bdarnell/etcd,glevand/coreos--etcd,handsomesun/etcd,bdarnell/etcd,chipironcin/etcd,zaphod-concur/etcd,mqliang/etcd,yudai/etcd,mkumatag/etcd,sebrandon1/etcd,YuleiXiao/etcd,visheshnp/etcd,lumjjb/etcd,ktateish/etcd,a-robinson/etcd,etcd-io/etcd,joshix/etcd,xiang90/etcd,fanminshi/etcd,sebrandon1/etcd,rnaveiras/etcd,jonboulle/etcd,gyuho/etcd,visheshnp/etcd,luxas/etcd,ravigadde/etcd,dnaeon/etcd,purpleidea/etcd,gyuho/etcd,whuwxl/etcd,fanminshi/etcd,glycerine/etcd,endocode/etcd,plasticbox/etcd,rchicoli/etcd,etcd-io/etcd,tguangch/etcd,sofuture/etcd,swingbach/etcd,rchicoli/etcd,qqsun8819/etcd,swingbach/etcd,dannysauer/etcd,StorReduce/etcd,mickep76/etcd,CrazyJvm/etcd,vimalk78/etcd,yudai/etcd,ajityagaty/etcd,cockroachdb/etcd,jlamillan/etcd,sinsharat/etcd,mqliang/etcd,vimalk78/etcd,bluebreezecf/etcd,westhood/etcd,OyTao/etcd_learning,tguangch/etcd,hongchaodeng/etcd,cockroachdb/etcd,ravigadde/etcd,zaphod-concur/etcd,xiang90/etcd,armstrongli/etcd,lorneli/etcd,li-ang/etcd,luxas/etcd,insequent/etcd,dannysauer/etcd,jonboulle/etcd,rnaveiras/etcd,ajityagaty/etcd,CrazyJvm/etcd,purpleidea/etcd,rnaveiras/etcd,westhood/etcd,bluebreezecf/etcd