create kuberentes-discovery image

hack/lib/golang.sh

@@ -31,6 +31,7 @@ kube::golang::server_targets() {
     cmd/kubeadm
     cmd/hyperkube
     cmd/kube-discovery
+    cmd/kubernetes-discovery
     plugin/cmd/kube-scheduler
   )
   echo "${targets[@]}"
@@ -165,6 +166,7 @@ readonly KUBE_STATIC_LIBRARIES=(
   kube-scheduler
   kube-proxy
   kube-discovery
+  kubernetes-discovery
   kubeadm
   kubectl
 )