K8SSAND-1787 ⁃ Cluster installation fails in ipv6 only kind environment

[tom-code]

What happened?
Cassandra cluster installation on ipv6 only kind cluster is not successful.
(dc pod is up and ready, but CassandraDatacenter object is in status "Cassandra Operator Progress: Updating" forever)

Did you expect to see something different?
Cassandra working on ipv6 environment without problems.

How to reproduce it (as minimally and precisely as possible):
Install on ipv6 only environment (with vm_prefer_ipv4: false)

Environment
ipv6 only kind

• Cass Operator version:
  v1.12.0

• Kubernetes version information:
  Server Version: version.Info{Major:"1", Minor:"23", GitVersion:"v1.23.5", GitCommit:"c285e781331a3785a7f436042c65c5641ce8a9e9", GitTreeState:"clean", BuildDate:"2022-03-24T22:06:50Z", GoVersion:"go1.17.8", Compiler:"gc", Platform:"linux/amd64"}

• Kubernetes cluster kind:
  ipv6 only kind

• Manifests:

• Cass Operator Logs:

Anything else we need to know?:
cass-operator compares ipv6 addresses in different formats (short format and full format(including 0:0:0)) which fails.
Pod has "short ipv6 ip" while NATIVE_ADDRESS_AND_PORT returned from cassandra has "full ipv6 ip".
Following patch solves my issue:

diff --git a/pkg/reconciliation/reconcile_racks.go b/pkg/reconciliation/reconcile_racks.go
index dad3e4d..f2df873 100644
--- a/pkg/reconciliation/reconcile_racks.go
+++ b/pkg/reconciliation/reconcile_racks.go
@@ -9,6 +9,7 @@ import (
        "sort"
        "strings"
        "time"
+       "net"
 
        appsv1 "k8s.io/api/apps/v1"
        corev1 "k8s.io/api/core/v1"
@@ -927,7 +928,8 @@ func (rc *ReconciliationContext) CreateUsers() result.ReconcileResult {
 
 func findHostIdForIpFromEndpointsData(endpointsData []httphelper.EndpointState, ip string) string {
        for _, data := range endpointsData {
-               if data.GetRpcAddress() == ip {
+               if net.ParseIP(data.GetRpcAddress()).Equal(net.ParseIP(ip)) {
                        return data.HostID
                }
        }

┆Issue is synchronized with this Jira Task by Unito
┆friendlyId: K8SSAND-1787
┆priority: Medium