Support Metrics Server as addon (#3560). (#3563)

* Support Metrics Server as addon (#3560).

* Update metrics server v0.3.1.

* Add metrics server test.

* Replace metrics server manifests with kubernetes/cluster/addons's.

* Modify metrics server manifests for kubespray.

* Follow PR#3558 node label node-role.kubernetes.io/master change

* Fix metrics server parameters base_metrics_server_... to metrics_server_...

* Fix too hard corded metrics_server_memory_per_node

* Add configurable insecure tls for metrics-apiservice

* Downloadable addon-resizer and extract parameter as variables

* Remove metrics server version from deployment name

* Metrics Server work when all masters has node role

* Download metrics-server and add-resizer container only on master

* ServiceAccount and ConfigMap is separated and fix application name

* Remove old metrics server clusterrole template

* Fix addon-resizer image specify

* Make InternalIP default for metrics_server_kubelet_preferred_address_types

Make InternalIP default because multiple preferrred address types does not work.

roles/download/defaults/main.yml

@@ -198,6 +198,9 @@ registry_image_repo: "registry"
 registry_image_tag: "2.6"
 registry_proxy_image_repo: "gcr.io/google_containers/kube-registry-proxy"
 registry_proxy_image_tag: "0.4"
+metrics_server_version: "v0.3.1"
+metrics_server_image_repo: "k8s.gcr.io/metrics-server-amd64"
+metrics_server_image_tag: "{{ metrics_server_version }}"
 local_volume_provisioner_image_repo: "quay.io/external_storage/local-volume-provisioner"
 local_volume_provisioner_image_tag: "v2.1.0"
 cephfs_provisioner_image_repo: "quay.io/external_storage/cephfs-provisioner"
@@ -209,6 +212,9 @@ ingress_nginx_default_backend_image_tag: "1.5"
 cert_manager_version: "v0.5.2"
 cert_manager_controller_image_repo: "quay.io/jetstack/cert-manager-controller"
 cert_manager_controller_image_tag: "{{ cert_manager_version }}"
+addon_resizer_version: "1.8.3"
+addon_resizer_image_repo: "k8s.gcr.io/addon-resizer"
+addon_resizer_image_tag: "{{ addon_resizer_version }}"
 
 downloads:
   netcheck_server:
@@ -548,6 +554,25 @@ downloads:
     groups:
       - kube-node
 
+  metrics_server:
+    enabled: "{{ metrics_server_enabled }}"
+    container: true
+    repo: "{{ metrics_server_image_repo }}"
+    tag: "{{ metrics_server_image_tag }}"
+    sha256: "{{ metrics_server_digest_checksum|default(None) }}"
+    groups:
+      - kube-master
+
+  addon_resizer:
+    # Currently addon_resizer is only used by metrics server
+    enabled: "{{ metrics_server_enabled }}"
+    container: true
+    repo: "{{ addon_resizer_image_repo }}"
+    tag: "{{ addon_resizer_image_tag }}"
+    sha256: "{{ addon_resizer_digest_checksum|default(None) }}"
+    groups:
+      - kube-master
+
   local_volume_provisioner:
     enabled: "{{ local_volume_provisioner_enabled }}"
     container: true