Add image prepare default role

Adds tripleo-container-image-prepare-default role to run the prepare
default command to generate ContainerImageParameters.

Change-Id: If5e8e75f5a572660a5aeed13c1b60bc5ea27032f

roles/tripleo-container-image-prepare-default/README.md

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+tripleo-container-image-prepare-default
+============================
+
+A role to perform the container image push against a registry.
+
+Requirements
+------------
+
+None.
+
+Role Variables
+--------------
+
+* `tripleo_container_image_prepare_default_debug`: (Boolean) Flag to print out the push command. Default: False
+* `tripleo_container_image_prepare_default_local_push_destination`: (Boolean) Include a push_Destination to trigger upload to a local registry on the undercloud. Default: false
+* `tripleo_container_image_prepare_default_output_env_file`: (String) File to write environment file containing default ContainerImagePrepare value. When not set, `tripleo_container_image_prepare_default_output` will contain yaml defining ContainerImagePrepare. Default is not set.
+
+Output Variables
+----------------
+
+* `tripleo_container_image_prepare_default_output`: (String) YAML defining a default ContainerImagePrepare value.
+* `tripleo_container_image_prepare_default_result`: Ansible execution results
+
+Dependencies
+------------
+
+None.
+
+Example Playbook
+----------------
+
+Example container prepare default execution playbook
+
+    - hosts: undercloud
+      gather_facts: true
+      tasks:
+        - name: Generate default ContainerImagePrepare
+          import_role:
+            name: tripleo-container-image-prepare-default
+          vars:
+            tripleo_container_image_prepare_output_env_file: /home/stack/container-image-prepare.yaml
+
+License
+-------
+
+Apache-2.0

roles/tripleo-container-image-prepare-default/defaults/main.yml

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+---
+# defaults file for tripleo-container-image-push
+tripleo_container_image_push_append_tag:
+tripleo_container_image_push_become: true
+tripleo_container_image_push_cleanup: false
+tripleo_container_image_push_debug: false
+tripleo_container_image_push_dry_run: false
+tripleo_container_image_push_local: false
+tripleo_container_image_push_multi_arch: false
+tripleo_container_image_push_password:
+tripleo_container_image_push_registry_url:
+tripleo_container_image_push_timeout: 360
+tripleo_container_image_push_username:

roles/tripleo-container-image-prepare-default/meta/main.yml

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+---
+# Copyright 2019 Red Hat, Inc.
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+
+galaxy_info:
+  author: OpenStack
+  description: TripleO Operator Role -- tripleo-container-image-prepare-default
+  company: Red Hat
+  license: Apache-2.0
+  min_ansible_version: 2.8
+  #
+  # Provide a list of supported platforms, and for each platform a list of versions.
+  # If you don't wish to enumerate all versions for a particular platform, use 'all'.
+  # To view available platforms and versions (or releases), visit:
+  # https://galaxy.ansible.com/api/v1/platforms/
+  #
+  platforms:
+    - name: CentOS
+      versions:
+        - 7
+        - 8
+
+  galaxy_tags:
+    - tripleo
+
+
+# List your role dependencies here, one per line. Be sure to remove the '[]' above,
+# if you add dependencies to this list.
+dependencies: []

roles/tripleo-container-image-prepare-default/tasks/main.yml

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+---
+# tasks file for tripleo-container-image-prepare-default
+- name: Setup container image prepare default facts
+  set_fact:
+    _prepare_cmd: >-
+      openstack tripleo container image prepare default
+      {{ tripleo_container_image_prepare_default_output_env_file | ternary('--output-env-file '
+      ~ tripleo_container_image_prepare_default_output_env_file, '') }}
+      {{ tripleo_container_image_prepare_default_local_push_destination | ternary('--local-push-destination', '') }}
+
+- name: Show the container image push command
+  debug:
+    var: _prepare_cmd
+  when: tripleo_container_image_prepare_default_debug|bool
+
+- name: Container image push
+  shell: "{{ _prepare_cmd }}"  # noqa 305
+  register: tripleo_container_image_prepare_default_result
+  changed_when: true
+
+- name: Set output variable
+  set_fact:
+    tripleo_container_image_prepare_default_result: "{{ tripleo_container_image_prepare_default_result.stdout }}"

roles/tripleo-container-image-prepare-default/tests/inventory

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+localhost
+

roles/tripleo-container-image-prepare-default/tests/test.yml

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+---
+- hosts: localhost
+  roles:
+    - tripleo-container-image-prepare-default
+  vars:
+    tripleo_container_image_prepare_default_output_env_file: "{{ ansible_env.HOME }}/container-image-prepare.yaml }}"