generate flannel manifest only on first master (#5983)
generate flannel manifest only on first master (#5983)


kubernetes-incubator/kargo,kubernetes-incubator/kubespray,kubernetes-incubator/kargo,Atoms/kubespray,kubernetes-incubator/kubespray,kubernetes-sigs/kubespray,kubernetes-sigs/kubespray,kubernetes-sigs/kubespray,Atoms/kubespray,Atoms/kubespray,kubernetes-sigs/kubespray,Atoms/kubespray