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/kubernetes-apps/ansible/templates/kubedns-autoscaler.yml

@@ -0,0 +1,49 @@
+# 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: kubedns-autoscaler
+  namespace: kube-system
+  labels:
+    k8s-app: kubedns-autoscaler
+    kubernetes.io/cluster-service: "true"
+    addonmanager.kubernetes.io/mode: Reconcile
+spec:
+  template:
+    metadata:
+      labels:
+        k8s-app: kubedns-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=kubedns-autoscaler
+          # Should keep target in sync with cluster/addons/dns/kubedns-controller.yaml.base
+          - --target=replicationcontroller/kubedns
+          - --default-params={"linear":{"nodesPerReplica":{{ kubedns_nodes_per_replica }},"min":{{ kubedns_min_replicas }}}}
+          - --logtostderr=true
+          - --v=2
+

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

@@ -1,5 +1,5 @@
-apiVersion: v1
-kind: ReplicationController
+apiVersion: extensions/v1beta1
+kind: Deployment
 metadata:
   name: kubedns
   namespace: {{ system_namespace }}
@@ -8,10 +8,11 @@ metadata:
     version: v19
     kubernetes.io/cluster-service: "true"
 spec:
-  replicas: {{ dns_replicas }}
+  replicas: {{ kubedns_min_replicas }}
   selector:
-    k8s-app: kubedns
-    version: v19
+    matchLabels:
+      k8s-app: kubedns
+      version: v19
   template:
     metadata:
       labels: