etcdmain: trigger embed.Etcd.Close for OS interrupt
etcdmain: trigger embed.Etcd.Close for OS interrupt

Signed-off-by: Gyu-Ho Lee <3454051ee3341eb69bdf6fca40899cdad4d86496@gmail.com>

rnaveiras/etcd,sinsharat/etcd,whuwxl/etcd,mickep76/etcd,bdarnell/etcd,mkumatag/etcd,xiang90/etcd,fanminshi/etcd,visheshnp/etcd,bdarnell/etcd,mqliang/etcd,ajityagaty/etcd,ajityagaty/etcd,etcd-io/etcd,etcd-io/etcd,bluebreezecf/etcd,xiang90/etcd,li-ang/etcd,yudai/etcd,cockroachdb/etcd,gyuho/etcd,heyitsanthony/etcd,fanminshi/etcd,a-robinson/etcd,dannysauer/etcd,sebrandon1/etcd,mqliang/etcd,rnaveiras/etcd,etcd-io/etcd,visheshnp/etcd,mqliang/etcd,YuleiXiao/etcd,mkumatag/etcd,yudai/etcd,glevand/coreos--etcd,armstrongli/etcd,sinsharat/etcd,plasticbox/etcd,bluebreezecf/etcd,glevand/coreos--etcd,vimalk78/etcd,sebrandon1/etcd,whuwxl/etcd,li-ang/etcd,YuleiXiao/etcd,vimalk78/etcd,gyuho/etcd,rnaveiras/etcd,a-robinson/etcd,mickep76/etcd,joshix/etcd,plasticbox/etcd,akauppi/etcd,cockroachdb/etcd,joshix/etcd,heyitsanthony/etcd,coreos/etcd,lorneli/etcd,lorneli/etcd,coreos/etcd,dannysauer/etcd,mkumatag/etcd,armstrongli/etcd,ajityagaty/etcd,akauppi/etcd