Comment 1 for bug 1998500

Reviewed: https://review.opendev.org/c/starlingx/distcloud/+/865853
Committed: https://opendev.org/starlingx/distcloud/commit/fe50d060c8fe282af3079fadca7ad80c232a2ea2
Submitter: "Zuul (22348)"
Branch: master

commit fe50d060c8fe282af3079fadca7ad80c232a2ea2
Author: Andre Carneiro <email address hidden>
Date: Mon Nov 28 11:20:36 2022 -0300

    Add check to prevent concurrent backup operations

    This commit adds semantic check to avoid concurrent backup and
    restore operations on the same subcloud. This check is used twice:
    - By the API, to return an error if all the subclouds, specified using
    either --subcloud or --group options, have an ongoing backup and
    restore operation.
    - By the backend, to filter out any subclouds where backup and
    restore operations are in progress so that concurrent
    operations aren't triggered.

    Test Plan:
    1. PASS - Validate that concurrent backup create operations can't be
    triggered on a subcloud using the --subcloud option.
    2. PASS - Validate that the API returns an error if all the subclouds
    specified have an ongoing backup create operation.
    3. PASS - Validate that concurrent backup operations aren't started on
    any subclouds when using the --group option.
    4. PASS - Validate that concurrent backup restore operations can't be
    triggered on a subcloud using the --subcloud option.
    5. PASS - Validate that the API returns an error if all the subclouds
    specified have an ongoing backup restore operation.
    6. PASS - Validate that concurrent backup restore operations aren't
    started on any subclouds when using the --group option.

    Closes-Bug: 1998500

    Signed-off-by: Andre Carneiro <email address hidden>
    Change-Id: Ic11de20d7a323c400070cc41131b81dc5e3ddd56