Add a rehome subcloud playbook

This commit creates a rehome_subcloud playbook to migrate an existing
subcloud from the original central cloud to a new central cloud. This
playbook is expected to be remotely play from the new central cloud
system controller based on the subcloud's overrides. This playbook
updates the system controller network info in the subcloud, migrates
the keystone data and updates the subcloud's ca and certs. After
running this playbook and unlock the subcloud controllers, the
subcloud can be discovered online in the new central cloud, and
can be managed and brought in-sync from the new central cloud.

Test:
Successfully migrate a AIOSX and a AIODX subcloud to the new central
cloud with this playbook.

Depends-On: https://review.opendev.org/c/starlingx/config/+/784767
Depends-On: https://review.opendev.org/c/starlingx/stx-puppet/+/785977
Depends-On: https://review.opendev.org/c/starlingx/config/+/786638
Depends-On: https://review.opendev.org/c/starlingx/config/+/787213

Story: 2008774
Task: 42152
Change-Id: Iaa6699951e855c76602bd43f71d42e64e298c786
Signed-off-by: Yuxing Jiang <yuxing.jiang@windriver.com>

playbookconfig/src/playbooks/roles/rehome-subcloud/prepare-env/tasks/main.yml

@@ -0,0 +1,88 @@
+---
+#
+# Copyright (c) 2021 Wind River Systems, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+#   This role is to check the target host environment before proceeding to
+#   the next step.
+#
+
+- name: Check if rehome is in progress
+  stat:
+    path: "{{ rehome_in_progress_flag }}"
+  register: rehome_in_progress
+
+- name: Fail if rehome is already in progress
+  fail:
+    msg: "Rehome is already in progress!"
+  when: rehome_in_progress.stat.exists
+
+- name: Set config path facts
+  set_fact:
+    keyring_permdir: "{{ platform_path + '/.keyring/' + software_version }}"
+    config_permdir: "{{ platform_path + '/config/' + software_version }}"
+    sysinv_permdir: "{{ platform_path + '/sysinv/' + software_version }}"
+    puppet_permdir: "{{ platform_path + '/puppet/' + software_version }}"
+
+- name: Set network facts
+  set_fact:
+    controller_floating_address: "{{ management_start_address }}"
+    management_subnet_prefix: "{{ management_subnet | ipaddr('prefix') }}"
+    management_broadcast: "{{ management_subnet | ipaddr('broadcast') }}"
+    external_oam_node_0_address: "{{ external_oam_node_0_address | default('derived') }}"
+    external_oam_node_1_address: "{{ external_oam_node_1_address | default('derived') }}"
+
+- name: Set derived facts for subsequent tasks/roles
+  set_fact:
+    derived_network_params:
+      'controller_0_address': "{{ controller_floating_address|ipmath(1) }}"
+      'controller_1_address': "{{ controller_floating_address|ipmath(2) }}"
+      'oam_start_address': "{{ external_oam_node_0_address if external_oam_node_0_address != 'derived'
+                           else external_oam_floating_address | ipmath(1) }}"
+
+- name: Get existing docker no_proxy
+  shell: >-
+    source /etc/platform/openrc; system service-parameter-list |
+    awk '($4 == "docker" && $8 == "no_proxy") {print $2}'
+  register: existing_docker_no_proxy_result
+
+- block:
+  - name: Set subcloud docker no_proxy facts
+    set_fact:
+      subcloud_no_proxy:
+        - localhost
+        - 127.0.0.1
+        - registry.local
+        - "{{ (cluster_service_subnet | ipaddr(1)).split('/')[0] }}"
+        - "{{ controller_floating_address }}"
+        - "{{ derived_network_params.controller_0_address }}"
+        - "{{ external_oam_floating_address }}"
+        - "{{ derived_network_params.oam_start_address }}"
+        - registry.central
+        - "{{ system_controller_oam_floating_address }}"
+      docker_no_proxy_combined: []
+
+  - name: Add user defined no-proxy address list to subcloud no proxy list
+    set_fact:
+      docker_no_proxy_combined: "{{ subcloud_no_proxy | union(docker_no_proxy) | ipwrap | unique }}"
+
+  when: existing_docker_no_proxy_result.stdout | length > 0
+
+- name: Get management interface of controller-0
+  shell: >-
+    source /etc/platform/openrc; system interface-network-list controller-0 |
+    awk '$8 == "mgmt" { print $6 }'
+  register: controller_0_management_interface_result
+
+- name: Get management interface of controller-1 if the subcloud is not simplex
+  shell: >-
+    source /etc/platform/openrc; system interface-network-list controller-1 |
+    awk '$8 == "mgmt" { print $6 }'
+  register: controller_1_management_interface_result
+  when: system_mode != 'simplex'
+
+- name: Create rehome in progress flag file
+  file:
+    path: "{{ rehome_in_progress_flag }}"
+    state: touch