Fix k8s cluster configs to allow scraping from Prometheus

Change-Id: I2b23f69c0160ad4f16734b4b4d0553a69581be86
diff --git a/comac/kubespray/extra-vars.yaml b/comac/kubespray/extra-vars.yaml
index b67911b..034ca39 100644
--- a/comac/kubespray/extra-vars.yaml
+++ b/comac/kubespray/extra-vars.yaml
@@ -33,6 +33,7 @@
 kubelet_deployment_type: host
 kubectl_localhost: true
 kubeconfig_localhost: true
+kube_proxy_metrics_bind_address: 0.0.0.0:10249
 
 kube_feature_gates: [SCTPSupport=True]
 kube_pods_subnet: 172.18.0.0/17