default Container newReference(URI uri, Object context) {
        return newReference(uri);
    }
Returns a reference to the currently active {@link Container}. Until {@link Container#release()} has been called,
the Container can not shut down.

@param uri The identifier used to match this Request to an appropriate {@link ClientProvider} or {@link
           RequestHandler}. The hostname must be "localhost" or a fully qualified domain name.
@param context that can be attached for reference tracking
@return A reference to the current Container.
@throws NoBindingSetSelectedException If no {@link BindingSet} was selected by the {@link BindingSetSelector}.
@throws BindingSetNotFoundException   If the named BindingSet was not found.
@throws ContainerNotReadyException    If no active Container was found, this can only happen during initial
                                      setup.
jdisc_core/src/main/java/com/yahoo/jdisc/service/CurrentContainer.java