Replace duplicate code to get klb crd path

As part of the change below, we are adding a utility code to get klb crd
path.

The klb crd shares the same namespace and the name as the service,
endpoints.

This code can be hence re-used for services too.

Depends-On: https://review.opendev.org/c/openstack/kuryr-kubernetes/+/804205
Change-Id: I90c8851e01de16b82617d60c987bad50a1522dd5

kuryr_kubernetes/controller/handlers/lbaas.py

@@ -114,11 +114,7 @@ class ServiceHandler(k8s_base.ResourceEventHandler):
     def on_finalize(self, service, *args, **kwargs):
         k8s = clients.get_kubernetes_client()
 
-        svc_name = service['metadata']['name']
-        svc_namespace = service['metadata']['namespace']
-
-        klb_crd_path = (f"{k_const.K8S_API_CRD_NAMESPACES}/"
-                        f"{svc_namespace}/kuryrloadbalancers/{svc_name}")
+        klb_crd_path = utils.get_klb_crd_path(service)
         # Bump all the NPs in the namespace to force SG rules
         # recalculation.
         self._bump_network_policies(service)