Add IPv6 support for network attachements

[hjensas]

When NETWORK_ISOLATION_IPV6 (default: false) is true, configure the NAD for IPv6.
Likewize NETWORK_ISOLATION_IPV4 (default: true) controls if IPv4 is configured.

Enabling both IPv6 and IPv4 should work for dual stack.

[openshift-ci]

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[softwarefactory-project-zuul]

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https://review.rdoproject.org/zuul/buildset/ba67db6b24a04cdbb8d03bbd3eff15f6

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 27m 34s
❌ install-yamls-crc-podified-edpm-baremetal RETRY_LIMIT in 11m 45s
❌ podified-multinode-edpm-deployment-crc FAILURE in 1h 04m 23s
❌ content-provider-data-plane-adoption-OSP-17-to-extracted-crc RETRY_LIMIT in 1h 11m 16s

[hjensas]

recheck

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Build failed (check pipeline). Post recheck (without leading slash)
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✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 26m 12s
❌ install-yamls-crc-podified-edpm-baremetal FAILURE in 1h 04m 36s
❌ podified-multinode-edpm-deployment-crc FAILURE in 1h 02m 30s
❌ content-provider-data-plane-adoption-OSP-17-to-extracted-crc RETRY_LIMIT in 1h 08m 58s

[hjensas]

It looks like wherabouts is quite dated, and does not contain the ipRanges support addded in: k8snetworkplumbingwg/whereabouts@950ab71

 failed (add): [openstack/glance-db-sync-ppn98/fa629d91-9963-46a2-b8f6-3c8d8260bc14:storage]: 
error adding container to network "storage": invalid CIDR : invalid CIDR address:

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✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 18m 03s
❌ install-yamls-crc-podified-edpm-baremetal RETRY_LIMIT in 3s
❌ podified-multinode-edpm-deployment-crc FAILURE in 1h 02m 50s

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✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 20m 54s
❌ install-yamls-crc-podified-edpm-baremetal FAILURE in 1h 05m 15s
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✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 21m 35s
❌ podified-multinode-edpm-deployment-crc FAILURE in 1h 04m 44s