Test that data-source can be defined in application.xml and used in persistence.xml.

Additional test modeled after the existing tests for a data-source in web.xml and the @DataSourceDefinition annotation. This time a data source (data-source element) in application.xml inside an EAR is tested.
Add a Name and a Short Description <name> & <description>

Shows up here; http://javaee-samples.github.io/#JPA