Remove hard-coded externaldns image versions

Related story: https://mirantis.jira.com/browse/PROD-22456

Change-Id: I7a0eb61cfc85ac71adc287bb9ee33e8c47cf9e97
diff --git a/classes/cluster/k8s-ha-contrail/kubernetes/init.yml b/classes/cluster/k8s-ha-contrail/kubernetes/init.yml
index 0c60de8..ac1de08 100644
--- a/classes/cluster/k8s-ha-contrail/kubernetes/init.yml
+++ b/classes/cluster/k8s-ha-contrail/kubernetes/init.yml
@@ -37,7 +37,7 @@
     kubernetes_netchecker_server_image: mirantis/k8s-netchecker-server:stable
     kubernetes_netchecker_agent_probeurls: "http://ipinfo.io"
     kubernetes_virtlet_image: mirantis/virtlet:v1.1.2
-    kubernetes_externaldns_image: mirantis/external-dns:latest
+
     kubernetes_externaldns_provider: coredns
 
     # switches of addons