[designate] admin_* options are based on v2 identity instead of v3

[Takashi Kajinami]

Currently neutron accepts the following parameters to set up identity for connecting to designate in admin context, but the list doesn't include domain parameters and it seems these parameters are based on keystone v2 indentity instead of keystone v3 identity.

- admin_username
- admin_password
- admin_tenant_id
- admin_tenant_name
- admin_auth_url'

Also, these parameters are a kind of duplicates of keystoneauth parameters and there is no clear reason why we need to define and use these parameters in neutron layer.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/790080

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/790080
Committed: https://opendev.org/openstack/neutron/commit/adfd853267ca529816f4c17a145d9e70e8abfac5
Submitter: "Zuul (22348)"
Branch: master

commit adfd853267ca529816f4c17a145d9e70e8abfac5
Author: Takashi Kajinami <email address hidden>
Date: Thu May 6 23:41:04 2021 +0900

    Deprecate [designate] admin_* parameters

    The admin_* parameters are implementing the same functionality as
    keystoneauth parameters alghouth these don't provide all parameters for
    Keystone v3 identity but are still based on Keystone v2 identity.
    This change deprecates these parameters so that we can remove
    such redundant and outdated definitions in a future release.

    Closes-Bug: #1927494
    Change-Id: I6294098008fbebb2e64922b3aaa085c1361d48a2

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 19.0.0.0rc1 release candidate.

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/900021

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/900021
Committed: https://opendev.org/openstack/neutron/commit/46c1220b383991b2641609b1a03a79e078798278
Submitter: "Zuul (22348)"
Branch: master

commit 46c1220b383991b2641609b1a03a79e078798278
Author: Takashi Kajinami <email address hidden>
Date: Fri Nov 3 16:34:36 2023 +0900

    Remove deprecated [designate] admin_* parameters

    These were deprecated during Xena cycle[1], so can be removed now.

    [1] adfd853267ca529816f4c17a145d9e70e8abfac5

    Related-Bug: #1927494
    Change-Id: I9fadaa6cfcd66409da47422505c145d9d67f6b8c