Parametrize overcloud-prep-containers script name.

Upgrading from P->Q will imply running the
overcloud-prep-containers role twice. As the
name used in the script is fix, the second
time the role will run will overwrite the
previous script file, which could be useful
for debugging purposes.

This patch adds a new parameter
'overcloud_prep_containers_script' which sets
the name of the script used to configure the
docker containers.

Change-Id: I7952872b110b25f67d66de0c5ea4610bfb0f0cb1

roles/overcloud-prep-containers/defaults/main.yml

@@ -1,9 +1,9 @@
 ---
-
 tripleo_common_dir: /usr/share/openstack-tripleo-common
 containerized_overcloud: false
-overcloud_prep_containers_script: overcloud-prep-containers.sh.j2
-overcloud_prep_containers_log: overcloud_prep_containers.log
+overcloud_prep_containers_template: overcloud-prep-containers.sh.j2
+overcloud_prep_containers_script: "overcloud-prep-containers.sh"
+overcloud_prep_containers_log: "overcloud_prep_containers.log"
 prepare_service_env_args: -e {{ overcloud_templates_path }}/environments/docker.yaml
 update_containers: false
 container_process_count: 8

roles/overcloud-prep-containers/tasks/create-scripts.yml

@@ -9,6 +9,6 @@
 
 - name: Create overcloud prep-containers script
   template:
-    src: "{{ overcloud_prep_containers_script }}"
-    dest: "{{ working_dir }}/overcloud-prep-containers.sh"
+    src: "{{ overcloud_prep_containers_template }}"
+    dest: "{{ working_dir }}/{{ overcloud_prep_containers_script }}"
     mode: 0755

roles/overcloud-prep-containers/tasks/overcloud-prep-containers.yml

@@ -28,6 +28,6 @@
 - name: Prepare for the containerized deployment
   shell: >
     set -o pipefail &&
-    {{ working_dir }}/overcloud-prep-containers.sh 2>&1 {{ timestamper_cmd }} >
+    {{ working_dir }}/{{ overcloud_prep_containers_script }} 2>&1 {{ timestamper_cmd }} >
     {{ overcloud_prep_containers_log }}
   when: containerized_overcloud|bool