[Jython] Support JNDI data sources via create_engine
JNDI db connections are common on some app server setups, and zxJDBC provides an alternative to zxJDBC.connect for getting a Connection via JNDI. Should we support a special scheme for using it via create_engine?
If so, what kind of URI scheme?
JNDI names are usually like 'jdbc/myoracle' or I think maybe 'java:/comp/env/jdbc/myoracle'