Allow disabling image_params_prepare task

This patch introduces a new parameter, disable_image_params_prepare, to
plan management tasks, so that operators can disable the task to
prepare image parameters during overcloud deployment.
This is useful when operators use an environment file to list all
container images with explicit tags used in deployment.

Related-Bug: #1896757
Change-Id: I278299f8f20c6b70eb3f26780f7454319059a12f

tripleo_ansible/playbooks/cli-create-deployment-plan.yaml

@@ -24,6 +24,7 @@
     container: overcloud
     source_url: null
     generate_passwords: true
+    disable_image_params_prepare: false
     plan_environment: plan-environment.yaml
     default_templates_dir: '/usr/share/openstack-tripleo-heat-templates/'
     use_default_templates: false
@@ -106,6 +107,7 @@
       tripleo_image_params_prepare:
         container: "{{ container }}"
         with_roledata: false
+      when: not (disable_image_params_prepare | bool)
 
     - name: Add root stack name
       tripleo_plan_parameters_update:

tripleo_ansible/playbooks/cli-update-deployment-plan.yaml

@@ -24,6 +24,7 @@
     container: overcloud
     generate_passwords: true
     reset_passwords: false
+    disable_image_params_prepare: false
     hide_sensitive_logs: true
 
   tasks:
@@ -39,6 +40,7 @@
       tripleo_image_params_prepare:
         container: "{{ container }}"
         with_roledata: false
+      when: not (disable_image_params_prepare | bool)
 
     - name: Get backup tempurl for GET
       tripleo_swift_tempurl: