Partial fix for OPENDJ-875: Use of hostnames in replication protocol causes failover problems

This partial fix addresses the first two bugs described in the issue comments, specifically:

* the logic (ReplicationBroker#filterServersInSameVM) which chooses the best RS does not prefer RS which are on the same host, only those which are in the same VM. In addition, the logic in ReplicationServer#isLocalReplicationServerPort assumes that the local host name is the same address which the RS is listening on

* the method ReplicationBroker#isSameReplicationServerUrl contains a typo which causes the second url to be interpreted as the local host name if the first url is a local address. This triggers all kinds of strange side effects during RS fail-over.