Right now the lbaas name and the service name are compared when
identifying a load balancer that exist with no matching service.
This might cause a wrong lbaas deletion as the service and the lbaas
name might differ. This commit fixes the issue by ensuring the
cluster_ip field of the service is used to verify the existence
of a matching lbaas.
Closes-bug: 1858108
Change-Id: I4a32b8ce3bae68b406f23429f2ad895dd44c9842