Parameterize several dependency endpoints so that they can be overridden with internal mirrors.

Signed-off-by: Chad Swenson <chadswen@gmail.com>

roles/download/defaults/main.yml

@@ -15,6 +15,7 @@ calico_cni_version: v1.4.2
 weave_version: v1.6.1
 flannel_version: v0.6.2
 flannel_server_helper_version: 0.1
+pod_infra_version: 3.0
 
 # Download URL's
 etcd_download_url: "https://storage.googleapis.com/kargo/{{etcd_version}}_etcd"
@@ -43,6 +44,8 @@ calico_node_image_repo: "calico/node"
 calico_node_image_tag: "{{ calico_version }}"
 hyperkube_image_repo: "quay.io/coreos/hyperkube"
 hyperkube_image_tag: "{{ kube_version }}_coreos.0"
+pod_infra_image_repo: "gcr.io/google_containers/pause-amd64"
+pod_infra_image_tag: "{{ pod_infra_version }}"
 
 downloads:
   calico_cni_plugin:
@@ -108,6 +111,10 @@ downloads:
     repo: "{{ calico_node_image_repo }}"
     tag: "{{ calico_node_image_tag }}"
     enabled: "{{ kube_network_plugin == 'calico' }}"
+  pod_infra:
+    container: true
+    repo: "{{ pod_infra_image_repo }}"
+    tag: "{{ pod_infra_image_tag }}"
 
 download:
   container: "{{ file.container|default('false') }}"