Download images as dependencies of roles

Pre download all required container images as roles' deps.
Drop unused flannel-server-helper images pre download.
Improve pods creation post-install test pre downloaded busybox.
Improve logs collection script with kubectl describe, fix sudo/etcd/weave
commands.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

roles/kubernetes-apps/ansible/defaults/main.yml

@@ -10,6 +10,8 @@ kubednsmasq_image_repo: "gcr.io/google_containers/kube-dnsmasq-amd64"
 kubednsmasq_image_tag: "{{ kubednsmasq_version }}"
 exechealthz_image_repo: "gcr.io/google_containers/exechealthz-amd64"
 exechealthz_image_tag: "{{ exechealthz_version }}"
+calico_policy_image_repo: "calico/kube-policy-controller"
+calico_policy_image_tag: latest
 
 # SSL
 etcd_cert_dir: "/etc/ssl/etcd/ssl"

roles/kubernetes-apps/ansible/templates/calico-policy-controller.yml.j2

@@ -23,7 +23,7 @@ spec:
       hostNetwork: true
       containers:
         - name: calico-policy-controller
-          image: calico/kube-policy-controller:latest
+          image: {{ calico_policy_image_repo }}:{{ calico_policy_image_tag }}
           env:
             - name: ETCD_ENDPOINTS
               value: "{{ etcd_access_endpoint }}"