Unable to create dns host-record with valid long characters

[Joseph Vazhappilly]

Brief Description
-----------------
The CLI call for creating service parameter dns host-record fails when using valid hostname as below,

system service-parameter-add dns host-record longname=www.abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijk.com,1.1.1.1

Severity
--------
Minor

Steps to Reproduce
------------------
1. Login as sysadmin
2. Create a host record via CLI and have 63 characters in the domain name, system service-parameter-add dns host-record longname=www.abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabc.com,1.1.1.1
3. Observed that dns name with 63 characters are created
4. Now create a host-record with more than 63 characters, system service-parameter-add dns host-record longname=www.abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijk.com,1.1.1.1
5. Observed that the dns name with 71 characters is not getting created

Expected Behavior
------------------
DNS host-records with valid domain names should be allowed

Actual Behavior
----------------
DNS host-records with valid long domain names are not created

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

System Configuration
--------------------
One node system

Branch/Pull Time/Commit
-----------------------
starlingx/master

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

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

Test Activity
-------------
Feature Testing

Workaround
----------
NA

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/config/+/903489
Committed: https://opendev.org/starlingx/config/commit/907c461db0b90495553845c5c5be329b0504f5fd
Submitter: "Zuul (22348)"
Branch: master

commit 907c461db0b90495553845c5c5be329b0504f5fd
Author: Joseph Vazhappilly <email address hidden>
Date: Tue Dec 12 05:53:42 2023 -0500

    Update dns hostname validation for host-records

    The validation of hostname in service parameter dns host-record
    is updated to use a new utility function. This function checks
    hostname to match the definitions as per RFCs (1035/3.1, 2181/11)

    Closes-bug: 2046246

    Test Plan:
    PASS: Verify build and install
    PASS: Verify service-parameter-add with valid & invalid hostname

    Change-Id: I6f13811764c0b793d15a5f94a1d6721fa5a1dc9b
    Signed-off-by: Joseph Vazhappilly <email address hidden>