Performs a DNS lookup on the IP address and returns a list of FQDN strings. Finds the DiscoveryAccess from the target node and attaches the list of FQDNs to it.
The target is a DDD node or a Host. If no names are found it returns an empty list. If an error occurs the
discovery.getNames function returns None.
The DNS lookup is performed from the appliance rather than the discovery target.