[IPI on Baremetal] ipv6 support issue in metal3-httpd

The metal3 Pod of openshift-machine-api is in CrashLoopBackOff status.

4.10.31

Always reproduce in IPv6

1. Preparing to configure ipi on the provisioning node
   - RHEL 8 ( haproxy, named, mirror registry, rhcos_cache_server ..)

2. configuring the install-config.yaml (attached)
   - provisioningNetwork: disabled
   - machine network: only IPv6
   - disconnected installation
   
3. deploy the cluster 

It is not possible to add worker nodes because metal3 does not start normally.

metal3 starts normally in IPv6 environment

1. attached must-gather
https://drive.google.com/file/d/1GKxj3syROIMnURx_PYzOYhJdEuXBNXVW/view?usp=sharing

2. pod status
[kni@prov ~]$ oc get pod
NAME                                           READY   STATUS             RESTARTS          AGE
cluster-autoscaler-operator-6656bfd7b9-bt4j8   2/2     Running            0                 35h
cluster-baremetal-operator-6bbdd6758-rmxgq     2/2     Running            0                 35h
machine-api-controllers-55fb545b56-kl5sj       7/7     Running            0                 34h
machine-api-operator-845b6cf855-q7gdd          2/2     Running            0                 35h
metal3-574876cfdb-98fmz                        6/7     CrashLoopBackOff   179 (3m17s ago)   14h
metal3-image-cache-5mq2w                       1/1     Running            0                 14h
metal3-image-cache-nftpj                       1/1     Running            0                 14h
metal3-image-cache-t7whh                       1/1     Running            0                 14h
metal3-image-customization-68d4d6d99b-dbqgn    1/1     Running            0                 15h

[kni@prov ~]$ oc logs metal3-574876cfdb-98fmz -c metal3-httpd
AH00526: Syntax error on line 8 of /etc/httpd/conf.d/vmedia.conf:
The port number "2001:feed:101::102" is outside the appropriate range (i.e., 1..65535).