Cleanup defaults file from kubernetes-apps and add dashboard to download role (#3800)

* Remove variables defined in download role. Fixes #3799

* Cleanup some more variables

* Fix bad templating

* Minor fix

* Add dashboard to download role. Fixes #3736

roles/download/defaults/main.yml

@@ -220,6 +220,9 @@ addon_resizer_version: "1.8.3"
 addon_resizer_image_repo: "k8s.gcr.io/addon-resizer"
 addon_resizer_image_tag: "{{ addon_resizer_version }}"
 
+dashboard_image_repo: "gcr.io/google_containers/kubernetes-dashboard-{{ image_arch }}"
+dashboard_image_tag: "v1.10.0"
+
 downloads:
   netcheck_server:
     enabled: "{{ deploy_netchecker }}"
@@ -626,6 +629,15 @@ downloads:
     groups:
       - kube-node
 
+  dashboard:
+    enabled: "{{ dashboard_enabled }}"
+    container: true
+    repo: "{{ dashboard_image_repo }}"
+    tag: "{{ dashboard_image_tag }}"
+    sha256: "{{ dashboard_digest_checksum|default(None) }}"
+    groups:
+      - kube-master
+
 download_defaults:
   container: false
   file: false