Auto create non-jta-data-source as a clone of jta-data-source and vice versa

In situations where someone has supplied only one of non-jta-data-source or jta-data-source, we could auto-create the matching datasource using the supplied datasource as a template. Currently we do auto-create the missing datasource, but we do so using the defaults in the service-jar.xml which is less than optimal as the datasources are unlikely to point at the same database.