B&R ansible inventory files not removed after succesfull operation

[Gustavo Herzmann]

Brief Description
-----------------
The ansible inventory files created during a backup and restore operation are not being removed after the operation ends. They should be removed after a successful operation, only remaining if it fails (for troubleshooting purposes).

Severity
--------
Minor: System/Feature is usable with minor issue

Steps to Reproduce
------------------
01. Create a new backup:
dcmanager subcloud-backup create --local-only --registry-images --subcloud subcloud6 --backup-values backup_values.yml

02. Restore the subcloud using the backup:
dcmanager subcloud-backup restore --with-install --local-only --registry-images --restore-values restore_values.yml --subcloud subcloud6

03. Check the /var/opt/dc/ansible directory for any of the following files:
subcloud6_backup_create_values.yml
subcloud6_backup_restore_values.yml
subcloud6_backup_delete_values.yml

Expected Behavior
------------------
The files should be removed after a successful B&R operation.

Actual Behavior
----------------
The files are not removed.

Reproducibility
---------------
100% reproducible

System Configuration
--------------------
Distributed cloud

Branch/Pull Time/Commit
-----------------------
2022-11-05 master

Last Pass
---------
NA.

Timestamp/Logs
--------------
NA.

Test Activity
-------------
NA.

Workaround
----------
NA.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/starlingx/distcloud/+/865194

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/distcloud/+/865194
Committed: https://opendev.org/starlingx/distcloud/commit/1bd7701eae9b352c7bb0be6f8784c5bbae88fddd
Submitter: "Zuul (22348)"
Branch: master

commit 1bd7701eae9b352c7bb0be6f8784c5bbae88fddd
Author: Gustavo Herzmann <email address hidden>
Date: Mon Nov 21 16:36:46 2022 -0300

    Remove B&R inventory files after successful operation

    Removes the following B&R inventory files from /var/opt/dc/ansible
    after a successful operation (backup, restore or delete):
    - <subcloud>_backup_create_values.yml
    - <subcloud>_backup_restore_values.yml
    - <subcloud>_backup_delete_values.yml

    Test plan:
    PASS: Execute 'dcmanager subcloud-backup create ...' and verify that
    the <subcloud>_backup_create_values.yml file was removed;
    PASS: Execute 'dcmanager subcloud-backup restore ...' and verify that
    the <subcloud>_backup_restore_values.yml file was removed;
    PASS: Execute 'dcmanager subcloud-backup delete ...' and verify that
    the <subcloud>_backup_delete_values.yml file was removed;

    Closes-Bug: #1997276

    Signed-off-by: Gustavo Herzmann <email address hidden>
    Change-Id: I292452f508d0d896f761bd0f55ec8963026a1e2b