Make allowedAddressPairs field mutable to support dynamic VIP updates

[jfpucheu]

/kind feature

Describe the solution you'd like

It would be beneficial to make this field mutable. In OpenStack, for example, we can dynamically add allowedAddressPairs without needing to restart or rebuild the server. A typical configuration might look like:

allowedAddressPairs:
  - ipAddress: 1.2.3.4

Anything else you would like to add:

This feature would be particularly useful in scenarios where we want to add new VIPs dynamically using tools like MetalLB or Kube-VIP, without having to rebuild or redeploy all nodes.
Enabling this flexibility would improve operational efficiency and align better with dynamic networking use cases.
Thanks you

Jeff

[Whisper40]

You are right, this configuration can be dynamically configured on Openstack.