Description of problem:

As the following RFC says, parent's NS record and child's NS record must be the same value.

https://www.ietf.org/rfc/rfc1034.txt
~~~
As the last installation step, the delegation NS RRs and glue RRs
necessary to make the delegation effective should be added to the parent
zone.  The administrators of both zones should insure that the NS and
glue RRs which mark both sides of the cut are consistent and remain so.


6.1. C.ISI.EDU name server

C.ISI.EDU is a name server for the root, MIL, and EDU domains of the IN
class, and would have zones for these domains.  The zone data for the
root domain might be:

    .       IN      SOA     SRI-NIC.ARPA. HOSTMASTER.SRI-NIC.ARPA. (
                            870611          ;serial
                            1800            ;refresh every 30 min
                            300             ;retry every 5 min
                            604800          ;expire after a week
                            86400)          ;minimum of a day
    EDU.    86400   NS      SRI-NIC.ARPA.  <====================================(*)parent's NS record
            86400   NS      C.ISI.EDU.     <====================================(*)parent's NS record


The master file for the EDU zone might be stated relative to the origin
EDU.  The zone data for the EDU domain might be:


    EDU.  IN SOA SRI-NIC.ARPA. HOSTMASTER.SRI-NIC.ARPA. (
                            870729 ;serial
                            1800 ;refresh every 30 minutes
                            300 ;retry every 5 minutes
                            604800 ;expire after a week
                            86400 ;minimum of a day
                            )
                    NS SRI-NIC.ARPA.       <====================================(*)child's NS record
                    NS C.ISI.EDU.          <====================================(*)child's NS record
~~~

In Designate, NS records comes from ns_records of pools.yaml.
The default value in TripleO is ns1.example.org., ns2.example.org. and ns3.example.org.
~~~
[root@overcloud-controller-0 ~]# grep ns_records  /var/lib/config-data/puppet-generated/designate/etc/designate/pools.yaml  -A 6
  ns_records:
    - hostname: ns1.example.org.
      priority: 1
    - hostname: ns2.example.org.
      priority: 2
    - hostname: ns3.example.org.
      priority: 3

(overcloud) [stack@undercloud ~]$ openstack recordset list zone0.designate.example.com. --fit
+-------------------------------------+------------------------------------+------+-------------------------------------+--------+--------+
| id                                  | name                               | type | records                             | status | action |
+-------------------------------------+------------------------------------+------+-------------------------------------+--------+--------+
| 94fd335c-cf11-43dc-87e8-ba4ea8dda38 | zone0.designate.example.com.       | NS   | ns3.example.org.                    | ACTIVE | NONE   | <===(*)
| 4                                   |                                    |      | ns1.example.org.                    |        |        | <===(*)
|                                     |                                    |      | ns2.example.org.                    |        |        | <===(*)
| ed6d2eaf-1453-4d1f-89bd-            | zone0.designate.example.com.       | SOA  | ns2.example.org.                    | ACTIVE | NONE   | <===(*)
| cc898e975a47                        |                                    |      | yatanaka.redhat.com. 1670322189     |        |        |
|                                     |                                    |      | 3545 600 86400 3600                 |        |        |
| 2ccc3643-0ad3-4ddc-8fe4-87c7d5e3d35 | test.zone0.designate.example.com.  | A    | 10.0.0.100                          | ACTIVE | NONE   |
| e                                   |                                    |      |                                     |        |        |
| 5f15cbd8-3486-4936-9146-b2e9dc54c23 | test2.zone0.designate.example.com. | A    | 10.0.0.101                          | ACTIVE | NONE   |
| c                                   |                                    |      |                                     |        |        |
+-------------------------------------+------------------------------------+------+-------------------------------------+--------+--------+
~~~

Therefore, ns_records of pools.yaml is really important parameter when we want to integrate Designate and the internet.
If wen cannot change ns_records of pools.yaml, we cannot integrate Designate and the internet.
We should be able to change ns_records of pools.yaml.

However, it seems that there is no THT value to configure ns_records.

  tripleo-ansible : https://github.com/openstack/tripleo-ansible/blob/stable/wallaby/tripleo_ansible/roles/designate_bind_pool/templates/pools.yaml.j2#L12-L16
  tripleo-heat-template : https://github.com/openstack/tripleo-heat-templates/blob/stable/wallaby/deployment/designate/designate-central-container-puppet.yaml#L224-L225

What do you think about adding a THT parameter to configure ns_records of pools.yaml?



Version-Release number of selected component (if applicable):
RHOSP 17.0

How reproducible:

Steps to Reproduce:
1. Deploy overcloud with designate

Actual results:
We cannot change ns_records of pools.yaml by THT parameter.

Expected results:
We can change ns_records of pools.yaml by THT parameter.