Calculate RendezvousIP from NMState data

Even if the RendezvousIP is not specified directly, we can still
calculate one from NMState data if it is provided. We already do this in
the regular agent ignition, so do the same in the unconfigured ignition.

There is no need to pass the host list because in the unconfigured
ignition hosts will not have assigned roles, so there is no additional
data there that can be used to improve the selection.

Author: zaneb

pkg/asset/agent/image/unconfigured_ignition.go

@@ -169,7 +169,7 @@ func (a *UnconfiguredIgnition) Generate(_ context.Context, dependencies asset.Pa
 	rendezvousHostTemplateFile := ignition.FileFromString(fmt.Sprintf("%s.template", rendezvousHostEnvPath), "root", 0644, rendezvousHostTemplateData)
 	config.Storage.Files = append(config.Storage.Files, rendezvousHostTemplateFile)
 
-	rendezvousIP, err := RetrieveRendezvousIP(agentConfig.Config, nil, nil)
+	rendezvousIP, err := RetrieveRendezvousIP(agentConfig.Config, nil, nmStateConfigs.Config)
 	if err == nil {
 		rendezvousHostData, err := getRendezvousHostEnvFromTemplate(rendezvousHostTemplateData, rendezvousIP)
 		if err != nil {