anchor.diff:                                [{dbdir, "dbdir"},
                                  {bucket_engine, "new-be"},
                                  {engines, "new-engines"}]},
  -                             {set, port_servers,
  +                             {set, {node, node(), port_servers},
                                 [{moxi, "moxi something"},
                                  {memcached, "memcached something"}]},
                                {set, {node, node(), ns_log}, default_log}]),
  
positive.code:                       [{dbdir, "dbdir"},
                         {bucket_engine, "old-be"},
                         {engines, "old-engines"}]},
                       {port_servers,
                        [{moxi, "moxi old something"},
                         {memcached, "memcached old something"}]},
                       {{node, node(), ns_log}, default_log}]],
  
negative.code:                     end, [],
                      [directory,
                       {node, node(), isasl},
                       {node, node(), port_servers},
                       {node, node(), ns_log}]).
  
  upgrade_config_from_1_7_to_1_7_1() ->
  