- change should not affect any existing configurations
- change solves issues with dual stack updates (#767)
- was unneeded and adds unneeded complexity
- retro-compatible change: keep using host/owner if set
- otherwise extract owner and eTLD+1 from domain field
- documentation updated to only use the `domain` field
- Remove `IPV6_PREFIX` environment variable (unneeded) and remove associated code
- Update all documentation for each provider supporting IPv6
- Build IPv6 as prefix:suffix when getting it from a public IP source for each record IPv6 suffix parameter
- Automatically disable provider_ip if public ip is IPv6 and IPv6 suffix is set (they are not compatible with each other)