For k8s cluster, the loadbalancers created for LoadBalancer type
services should be deleted before the cluster deletion.
Change-Id: I75f44187b7be7d0ffb6a8f195f755de4b1564335
Closes-Bug: #1712062
(cherry picked from commit e18ced4d5c)
Depends-On: https://review.openstack.org/#/c/625766/