Fixed the bug mentioned before, now all nodes join, with good keys.

Note: Ownership information does not include topology, please specify a keyspace.
Address         DC          Rack        Status State   Load            Owns                Token
                                                                                           169273719020049289134547954145910618441
                                                                                           10.0.0.20       datacenter1 rack1       Up     Normal  9.08 KB         100.00%             0
                                                                                           10.0.0.19       datacenter1 rack1       Up     Joining 4.58 KB         0.00%               112676359412003132998911472258008533725
                                                                                           10.0.0.21       datacenter1 rack1       Up     Joining 4.58 KB         0.00%               169273719020049289134547954145910618441