default to kubedns and set nxdomain in kubedns deployment if that's the dns_mode

roles/kubernetes-apps/ansible/templates/kubedns-deploy.yml

@@ -82,6 +82,9 @@ spec:
         - --server=127.0.0.1#10053
 {% if kube_log_level == '4' %}
         - --log-queries
+{% endif %}
+{% if dns_mode == 'kubedns' %}
+        - --local=/{{ bogus_domains }}
 {% endif %}
         ports:
         - containerPort: 53