When direct_client.direct_get_suffix_hashes raises a
DirectClientException the exception message and variables
should report the replication_ip and replication_port, as
opposed to the ip and port values reported for all other
case when the exception is raised.
Add option to override ip and port reported in
DirectClientException.
Also adds unit tests to verify both cases.
Related-Bug: 1566395
Change-Id: If3d952847c7199f4e9f6164858085367266386d2
5d56f40f04