Load Balancer doesn't get created when there are too many VMs

When the number of VMs are higher than the `default.page.size` global setting in CloudStack (defaults to 500), the load balancer doesn't get created and it fails with this error in the logs:
```
E0713 01:20:25.311237 1 controller.go:310] error processing service default/test-svc (will retry): failed to ensure load balancer: none of the hosts matched the list of VMs retrieved from CS API
```

As a work around, increasing `default.page.size` works for now.

Start at controller.go:310 and trace the CloudStack API request that retrieves VMs while ensuring the load balancer for a service. Check how the default.page.size limit affects that retrieval. Done means a load balancer is created successfully when the VM count exceeds the default page size without requiring a setting change.

Written by the indexing model from the issue text.