binding subcontexts with <lookup> does not work

If you attempt to bind a subcontext via <lookup> in the naming subsystem it will fail when anything is looked up under it.

To reproduce, add <lookup name="java:jboss/ds" lookup="java:jboss/datasources"/>, and then look up something under java:jboss/ds/

In ServiceBasedNamingStore.lookup() it needs to return a ResolveResult, but the (!(obj instanceof NamingContext)) check skips it.

As a work-around, you can write an object factory which looks up the sub-context and then returns a wrapper around it, a Context implementation which simply delegates all methods to the original context. Since that wrapper is not a NamingContext instance, it works.