Make RemovedObjectProxy implement accept(CatalogVisitor)

RemovedObjectProxy is used to notify the local CatalogListener's
that anotehr cluster member has removed such CatalogInfo object.
Yet it didn't proxy the accept(CatalogVisitor) method so the
ResourcePool CatalogListener in charge of cleaning up locally
cached resources such as DataStore instances didn't have a chance
to run, leaving stale resources on every cluster node but the
one that performed the object removal.