Add autoscalers for dnsmasq and kubedns

By default kubedns and dnsmasq scale when installed.
Dnsmasq is no longer a daemonset. It is now a deployment.
Kubedns is no longer a replicationcluster. It is now a deployment.
Minimum replicas is two (to enable rolling updates).

Reduced memory erquirements for dnsmasq and kubedns

roles/dnsmasq/templates/dnsmasq-autoscaler.yml

@@ -0,0 +1,50 @@
+# Copyright 2016 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: dnsmasq-autoscaler
+  namespace: kube-system
+  labels:
+    k8s-app: dnsmasq-autoscaler
+    kubernetes.io/cluster-service: "true"
+    addonmanager.kubernetes.io/mode: Reconcile
+spec:
+  template:
+    metadata:
+      labels:
+        k8s-app: dnsmasq-autoscaler
+      annotations:
+        scheduler.alpha.kubernetes.io/critical-pod: ''
+        scheduler.alpha.kubernetes.io/tolerations: '[{"key":"CriticalAddonsOnly", "operator":"Exists"}]'
+    spec:
+      containers:
+      - name: autoscaler
+        image: gcr.io/google_containers/cluster-proportional-autoscaler-amd64:1.1.1
+        resources:
+            requests:
+                cpu: "20m"
+                memory: "10Mi"
+        command:
+          - /cluster-proportional-autoscaler
+          - --namespace=kube-system
+          - --configmap=dnsmasq-autoscaler
+          - --target=ReplicationController/dnsmasq
+          # When cluster is using large nodes(with more cores), "coresPerReplica" should dominate.
+          # If using small nodes, "nodesPerReplica" should dominate.
+          - --default-params={"linear":{"nodesPerReplica":{{ dnsmasq_nodes_per_replica }},"preventSinglePointFailure":true}}
+          - --logtostderr=true
+          - --v={{ kube_log_level }}
+

roles/dnsmasq/templates/dnsmasq-deploy.yml

@@ -1,16 +1,22 @@
 ---
 apiVersion: extensions/v1beta1
-kind: DaemonSet
+kind: Deployment
 metadata:
   name: dnsmasq
   namespace: "{{system_namespace}}"
   labels:
     k8s-app: dnsmasq
+    kubernetes.io/cluster-service: "true"
 spec:
+  replicas: {{ dnsmasq_min_replicas }}
+  selector:
+    matchLabels:
+      k8s-app: dnsmasq
   template:
     metadata:
       labels:
         k8s-app: dnsmasq
+        kubernetes.io/cluster-service: "true"
     spec:
       containers:
         - name: dnsmasq
@@ -55,3 +61,4 @@ spec:
           hostPath:
             path: /etc/dnsmasq.d-available
       dnsPolicy: Default  # Don't use cluster DNS.
+