Wrong NamingContext installation

To have the right NamigContext installed, ie. the one from the NuxeoContainer, we need to implement a javaURLContextFactory class in the org.nuxeo.runtime.jtajca.java package.
We noticed this when running a test using the AuditFeature (so deploying datasources) with the Nuxeo SDK test classpath. Indeed, this one includes the jetty-naming lib that defines org.mortbay.naming jndi properties, so the installed NamingContext was the Jetty one instead of Nuxeo's JtaJca one.