Fix full refresh error when running a RefreshWorker

```
An unhandled error has occurred: uninitialized constant ManageIQ::Providers::Openshift::RefreshMemory
    @memory ||= provider_class::RefreshMemory.new
                              ^^^^^^^^^^^^^^^
app/models/manageiq/providers/kubevirt/infra_manager/refresh_worker/runner.rb:75:in `memory'
app/models/manageiq/providers/kubevirt/infra_manager/refresh_worker/runner.rb:194:in `block in start_watches'
```

app/models/manageiq/providers/openshift/infra_manager/refresh_memory.rb

@@ -0,0 +1,2 @@
+class ManageIQ::Providers::Openshift::InfraManager::RefreshMemory < ManageIQ::Providers::Kubevirt::InfraManager::RefreshMemory
+end