CHANGELOG-4.0: deprecate "etcdctl backup" command
CHANGELOG-4.0: deprecate "etcdctl backup" command

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

li-ang/etcd,fanminshi/etcd,bdarnell/etcd,joshix/etcd,ajityagaty/etcd,dannysauer/etcd,mkumatag/etcd,lorneli/etcd,glevand/coreos--etcd,lorneli/etcd,mqliang/etcd,sebrandon1/etcd,bdarnell/etcd,cockroachdb/etcd,joshix/etcd,etcd-io/etcd,rnaveiras/etcd,li-ang/etcd,xiang90/etcd,fanminshi/etcd,rnaveiras/etcd,sinsharat/etcd,vimalk78/etcd,gyuho/etcd,xiang90/etcd,mqliang/etcd,sebrandon1/etcd,dannysauer/etcd,mqliang/etcd,mkumatag/etcd,mkumatag/etcd,coreos/etcd,coreos/etcd,cockroachdb/etcd,ajityagaty/etcd,rnaveiras/etcd,ajityagaty/etcd,etcd-io/etcd,sinsharat/etcd,glevand/coreos--etcd,gyuho/etcd,etcd-io/etcd,vimalk78/etcd