Add data source configuration files for Ingres RDBMS support

I'm working on getting JBoss going against the Ingres RDBMS database server. I've got some initial config files that can be included as part of the data source configurations. I have other patches for different components, but this issue is just to get two data source definitions added to the jbossas/trunk/connector/src/etc/example-config directory, one for a local-tx-datasource and one for a xa-datasource.