Add function to check for OCP IPv6 cluster network

The RabbitMQ config differs for IPv6 so add a function to determine if IPv6
is enabled on the OCP cluster network, similar to the FIPS mode check

modules/common/ocp/ocp.go

@@ -18,11 +18,14 @@ package ocp
 
 import (
 	"context"
+	"strings"
 
 	"github.com/openstack-k8s-operators/lib-common/modules/common/helper"
 
+	networkv1 "github.com/openshift/api/network/v1"
 	"gopkg.in/yaml.v3"
 	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
 )
 
@@ -47,3 +50,24 @@ func IsFipsCluster(ctx context.Context, h *helper.Helper) (bool, error) {
 	}
 	return fipsEnabled, nil
 }
+
+// HasIPv6ClusterNetwork - Check if OCP has an IPv6 cluster network
+func HasIPv6ClusterNetwork(ctx context.Context, h *helper.Helper) (bool, error) {
+	networkConfig := &networkv1.ClusterNetwork{
+		TypeMeta: metav1.TypeMeta{
+			APIVersion: "config.openshift.io/v1",
+			Kind:       "Network",
+		},
+	}
+	err := h.GetClient().Get(ctx, types.NamespacedName{Name: "cluster"}, networkConfig)
+	if err != nil {
+		return false, err
+	}
+
+	for _, clusterNetwork := range networkConfig.ClusterNetworks {
+		if strings.Count(clusterNetwork.CIDR, ":") >= 2 {
+			return true, nil
+		}
+	}
+	return false, nil
+}