Replace keepalived single class with k8s keepalived instance

Also add default variables to kube_apisrver keepalived instance

Change-Id: I77be7ab63345f17492a08f552721235a3af17f2e
Related-PROD: PROD-20456
diff --git a/kubernetes/master/cluster.yml b/kubernetes/master/cluster.yml
index 1295f3a..78ff659 100644
--- a/kubernetes/master/cluster.yml
+++ b/kubernetes/master/cluster.yml
@@ -1,8 +1,8 @@
 classes:
 - service.kubernetes.master.cluster
-- service.keepalived.cluster.single
 - service.haproxy.proxy.single
 - system.haproxy.proxy.listen.kubernetes.apiserver
+- system.keepalived.cluster.instance.kube_api_server_vip
 parameters:
   _param:
     kubernetes_netchecker_agent_repo: mirantis