IPVS Fullstate Support for IPv6

[aroradaman]

In continuation to #417.

Passes e2e for ipv4, ipv6 and dual on Ubuntu 22.04.1 LTS.

[jayunit100]

/lgtm
/approve

[jayunit100]

/retest

[jayunit100]

wait cant this just be if IPv4 or IPv6 then

IPs = append(...

[aroradaman]

func getExternalIPss(service *localv1.Service, ipFamily v1.IPFamily) ([]string, error) {
	if service.IPs.ExternalIPs != nil {
		if ipFamily == v1.IPv4Protocol {
			return service.IPs.ExternalIPs.GetV4(), nil
		} else if ipFamily == v1.IPv6Protocol {
			return service.IPs.ExternalIPs.GetV6(), nil
		}else{
			return nil, errors.New(fmt.Sprint("ipfamily [%v] not supported", ipFamily))		
		}
	} else {
		return nil, errors.New("no ips found")
	}
}

@jayunit100 something like this ?

[aroradaman]

wait can't this just be IPv4 or IPv6 then

Entries in an IPSet can only belong to one IPFamily, so I loop service creation logic for both the ipFamilies.

// iterate over ipFamily
for _, ipFamily := range []v1.IPFamily{v1.IPv4Protocol, v1.IPv6Protocol} {
    / /iterate over NodeIPs
    for _, nodeIP := range getNodeIPs(ipFamily) {
        ....
    }
}

And then I pick the relevant IPSet accordingly

kubeNodePortTCPIPSet  = map[v1.IPFamily]string{
    v1.IPv4Protocol: "KUBE-NODE-PORT-TCP",
    v1.IPv6Protocol: "KUBE-6-NODE-PORT-TCP",
}

[aroradaman]

/retest

[k8s-ci-robot]

@daman1807: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[jayunit100]

/approve
/lgtm
/retest
/test-this-please

[aroradaman]

@jayunit100 all the tests (Security / govulncheck) pass now, we can merge this.

[jayunit100]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: daman1807, jayunit100

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• backends/OWNERS [jayunit100]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment