Allow common role to pull images

Change-Id: I3de01770eca6b7e681b7964a6d6e15564065aaea
Partially-Implements: blueprint pre-pull-images

ansible/roles/common/tasks/deploy.yml

+---
+- include: config.yml
+
+- include: start.yml

ansible/roles/common/tasks/main.yml

 ---
-- include: config.yml
-
-- include: start.yml
+- include: "{{ action }}.yml"

ansible/roles/common/tasks/pull.yml

+---
+- name: Pulling rsyslog image
+  kolla_docker:
+    action: "pull_image"
+    common_options: "{{ docker_common_options }}"
+    image: "{{ rsyslog_image_full }}"
+
+- name: Pulling kolla-ansible image
+  kolla_docker:
+    action: "pull_image"
+    common_options: "{{ docker_common_options }}"
+    image: "{{ ansible_image_full }}"

tools/kolla-ansible

@@ -34,6 +34,7 @@ Options:
 
 Commands:
     deploy  Deploy and start all kolla containers
+    pull    Pull all images for containers (only pulls, no runnnig container changes)
 EOF
 }
 
@@ -79,8 +80,12 @@ done
 case "$1" in
 
 (deploy)
-        ACTION="Deploying Playbook"
-        CMD="ansible-playbook -i $INVENTORY -e @/etc/kolla/globals.yml -e @/etc/kolla/passwords.yml $PLAYBOOK"
+        ACTION="Deploying Playbooks"
+        CMD="ansible-playbook -i $INVENTORY -e @/etc/kolla/globals.yml -e @/etc/kolla/passwords.yml $PLAYBOOK -e action=deploy"
+        ;;
+(pull)
+        ACTION="Pulling Docker images"
+        CMD="ansible-playbook -i $INVENTORY -e @/etc/kolla/globals.yml -e @/etc/kolla/passwords.yml $PLAYBOOK -e action=pull"
         ;;
 
 (*)     usage