Rename ironic database password during upgrades

'ironic_galera_password' was renamed to
'ironic_container_mysql_password' in change
I399211c139d6388ab56b97b809f93d4936907c7a.

Update the user-secrets-adjustment upgrade playbook to handle renaming
within the user's secrets file and ensure that the original value is
kept.

Change-Id: Idca153bc474b415316ce59a5e7068d030af81fe9
Closes-Bug: 1625081

scripts/upgrade-utilities/playbooks/user-secrets-adjustment.yml

@@ -22,6 +22,14 @@
     - name: Read example user secrets file
       shell: "grep '^[a-zA-Z]' {{ playbook_dir }}/../../../etc/openstack_deploy/user_secrets.yml"
       register: secrets
+    - name: Rename changed secrets
+      lineinfile:
+        dest: "/etc/openstack_deploy/{{ _osa_secrets_file_name }}"
+        regexp: "^{{ item.old_name }}: (.*)$"
+        line: "{{ item.new_name }}: \\1"
+        backrefs: yes
+      with_items:
+        - { old_name: "ironic_galera_password", new_name: "ironic_container_mysql_password" }
     - name: Read user secrets file
       shell: "grep '^[a-zA-Z]' /etc/openstack_deploy/{{ _osa_secrets_file_name }}"
       register: user_secrets