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Standardize VRRP group IDs
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We use multiple VRRP group IDs usually loosely (as it's a value from 0 to 255) matching the VLAN ID.

This is useful when there are different VRRP groups in the same vlan, which we don't do. Furthermore ulsfo uses a value of 1 for both v4 and v6 in all vlans.

I suggest we use 1 everywhere, and remove the Netbox custom field, to keep the config lean.

As changing it is impactful (split-brain), we should do it when the site is depooled. However there is no urgency.