Restore failing due to existing certificate

[Thiago Paiva Brito]

Brief Description
-----------------
When some problem happens and the restore playbook fails, besides doing the workaround described on [1], the playbook is also failing trying to re-add the ssl_ca certificate that is already on the system.

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

Steps to Reproduce
------------------
Try to re-run the restore on a failure after [2]

Expected Behavior
------------------
Restore proceeds to the end

Actual Behavior
----------------
Restore fails at task [bootstrap/persist-config : Wait for certificate install]

Reproducibility
---------------
2/2

System Configuration
--------------------
AIO-SX, but will happen in other configurations

Branch/Pull Time/Commit
-----------------------
2022-08-22

Last Pass
---------
2022-08-10

Timestamp/Logs
--------------
TBD

Test Activity
-------------
Developer Testing

Workaround
----------
Delete the cert manually, do the workaround on [1] and retry restore

[1]https://bugs.launchpad.net/starlingx/+bug/1987536
[2]https://github.com/starlingx/ansible-playbooks/blob/dcf078ce8e8ed3661938e90374f0c7c96212334a/playbookconfig/src/playbooks/roles/bootstrap/persist-config/tasks/main.yml#L338

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/starlingx/ansible-playbooks/+/854444

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/ansible-playbooks/+/854444
Committed: https://opendev.org/starlingx/ansible-playbooks/commit/9900eb141b1cde09ee0181b667fc720056dfc3d1
Submitter: "Zuul (22348)"
Branch: master

commit 9900eb141b1cde09ee0181b667fc720056dfc3d1
Author: Thiago Brito <email address hidden>
Date: Wed Aug 24 14:52:16 2022 -0300

    Fix restore rerun failing due to existing cert

    The check for existing certificates was added on [1], but the use case
    for bootstrap during restore wasn't covered on tests. When re-running
    the restore, now we will also remove the previously existing
    certificates so they can be re-added without errors.

    [1] https://github.com/starlingx/ansible-playbooks/commit/6130e999d56b14e56c384f69bc079c78fdb1104c

    TEST PLAN
    PASS restore platform (Debian AIO-SX)
    PASS create new certificate, install, take backup, restore, interrupt
         play, remove .restore_in_progress flag and re-run restore; checked
         that extra certificate is listed on `system certificate-list`

    Closes-Bug: #1987555
    Signed-off-by: Thiago Brito <email address hidden>
    Change-Id: Ic217a5c88ea5c8602d8fc959796c0a687ebe76aa