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-deploy.yml

@@ -0,0 +1,115 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: kubedns
+  namespace: {{ system_namespace }}
+  labels:
+    k8s-app: kubedns
+    version: v19
+    kubernetes.io/cluster-service: "true"
+spec:
+  replicas: {{ kubedns_min_replicas }}
+  selector:
+    matchLabels:
+      k8s-app: kubedns
+      version: v19
+  template:
+    metadata:
+      labels:
+        k8s-app: kubedns
+        version: v19
+        kubernetes.io/cluster-service: "true"
+    spec:
+      containers:
+      - name: kubedns
+        image: "{{ kubedns_image_repo }}:{{ kubedns_image_tag }}"
+        imagePullPolicy: {{ k8s_image_pull_policy }}
+        resources:
+          # TODO: Set memory limits when we've profiled the container for large
+          # clusters, then set request = limit to keep this container in
+          # guaranteed class. Currently, this container falls into the
+          # "burstable" category so the kubelet doesn't backoff from restarting it.
+          limits:
+            cpu: {{ dns_cpu_limit }}
+            memory: {{ dns_memory_limit }}
+          requests:
+            cpu: {{ dns_cpu_requests }}
+            memory: {{ dns_memory_requests }}
+        livenessProbe:
+          httpGet:
+            path: /healthz
+            port: 8080
+            scheme: HTTP
+          initialDelaySeconds: 60
+          timeoutSeconds: 5
+          successThreshold: 1
+          failureThreshold: 5
+        readinessProbe:
+          httpGet:
+            path: /readiness
+            port: 8081
+            scheme: HTTP
+          # we poll on pod startup for the Kubernetes master service and
+          # only setup the /readiness HTTP server once that's available.
+          initialDelaySeconds: 30
+          timeoutSeconds: 5
+        args:
+        # command = "/kube-dns"
+        - --domain={{ dns_domain }}.
+        - --dns-port=10053
+        - --v={{ kube_log_level }}
+        ports:
+        - containerPort: 10053
+          name: dns-local
+          protocol: UDP
+        - containerPort: 10053
+          name: dns-tcp-local
+          protocol: TCP
+      - name: dnsmasq
+        image: "{{ kubednsmasq_image_repo }}:{{ kubednsmasq_image_tag }}"
+        imagePullPolicy: {{ k8s_image_pull_policy }}
+        resources:
+          limits:
+            cpu: {{ dns_cpu_limit }}
+            memory: {{ dns_memory_limit }}
+          requests:
+            cpu: {{ dns_cpu_requests }}
+            memory: {{ dns_memory_requests }}
+        args:
+        - --log-facility=-
+        - --cache-size=1000
+        - --no-resolv
+        - --server=127.0.0.1#10053
+{% if kube_log_level == '4' %}
+        - --log-queries
+{% endif %}
+        ports:
+        - containerPort: 53
+          name: dns
+          protocol: UDP
+        - containerPort: 53
+          name: dns-tcp
+          protocol: TCP
+      - name: healthz
+        image: "{{ exechealthz_image_repo }}:{{ exechealthz_image_tag }}"
+        imagePullPolicy: {{ k8s_image_pull_policy }}
+        resources:
+          # keep request = limit to keep this container in guaranteed class
+          limits:
+            cpu: 10m
+            memory: 50Mi
+          requests:
+            cpu: 10m
+            # Note that this container shouldn't really need 50Mi of memory. The
+            # limits are set higher than expected pending investigation on #29688.
+            # The extra memory was stolen from the kubedns container to keep the
+            # net memory requested by the pod constant.
+            memory: 50Mi
+        args:
+        - -cmd=nslookup kubernetes.default.svc.{{ dns_domain }} 127.0.0.1 >/dev/null && nslookup kubernetes.default.svc.{{ dns_domain }} 127.0.0.1:10053 >/dev/null
+        - -port=8080
+        - -quiet
+        ports:
+        - containerPort: 8080
+          protocol: TCP
+      dnsPolicy: Default  # Don't use cluster DNS.