disable external-dns by default

Change-Id: Ibb9031795903cbfd6e44e482e2ce0ced0b8019ac
diff --git a/metadata/service/common.yml b/metadata/service/common.yml
index 8c921db..3faf65f 100644
--- a/metadata/service/common.yml
+++ b/metadata/service/common.yml
@@ -47,7 +47,7 @@
           image: coredns/coredns:latest
           etcd_image: quay.io/coreos/etcd:v3.1.0
         externaldns:
-          enabled: True
+          enabled: False
           namespace: kube-system
           image: mirantis/external-dns:latest
           domain: ${_param:kubernetes_cluster_domain}