Remind users to sync saved objects in order for training model to show up in Kibana

We should consider automatically [synchronizing Kibana saved objects](https://www.elastic.co/guide/en/kibana/master/machine-learning-api-sync.html) after using eland_import_hub_model to import a training model to Elasticsearch, or add an output message to the `docker run -it --rm --network host elastic/eland eland_import_hub_model` script at the end of the process to instruct the user to either call the Kibana API or click on `Synchronize saved objects` from the ML UI to manually sync the objects in order for the training model to show up.

This will improve the user experience when using the import script.