[Console Log]Notify as a warning message when Nuxeo uses the embedded DB

Whenever we run Nuxeo, it should be useful to have a warning message in the logs, during the startup, saying that we use the embedded DB.
We have to check the audit conf and the VCS configuration as well.
This text can be the same as the one that is used to notify about the embedded Elasticsearch.

The configuration between logs and the document storage can be different, please consider the case of using mongodb (DBS) + h2 (Audit).