bootstrap did not validate if management_multicast_subnet is accepting correct multicast address

[Lucas Ratusznei Fonseca]

Brief Description
-----------------
Bootstrap is accepting invalid multicast addresses for management_multicast_subnet, like f05::8:0:153:0/112.

Severity
--------
Standard

Steps to Reproduce
------------------
Run bootstrap with management_multicast_subnet in invalid range.

Expected Behavior
------------------
Bootstrap fails validation step.

Actual Behavior
----------------
Bootstrap passes validation step.

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

System Configuration
--------------------
AIO-SX IPv4, AIO-SX IPv6

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/starlingx/ansible-playbooks/+/910346

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/ansible-playbooks/+/910346
Committed: https://opendev.org/starlingx/ansible-playbooks/commit/c2950622ca6c39fa7fcb77a2a4777dd0a2b65bed
Submitter: "Zuul (22348)"
Branch: master

commit c2950622ca6c39fa7fcb77a2a4777dd0a2b65bed
Author: Lucas Ratusznei Fonseca <email address hidden>
Date: Tue Feb 27 11:43:53 2024 -0300

    Add multicast address validation

    This commit adds validation for multicast addresses. The playbook fails
    if addresses intended for multicast are not in correct range.

    Test plan

    Systems: AIO-SX IPv4, AIO-SX IPv6

    [PASS] Run playbook with management_multicast_subnet not in valid
           multicast range, check that fails validation
    [PASS] Run playbook with management_multicast_subnet in valid
           multicast range, check that passes validation

    Closes-Bug: #2055172
    Change-Id: If1b1de53b4c3a64205e975ec8304191058822a99
    Signed-off-by: Lucas Ratusznei Fonseca <email address hidden>