When multiple servers with the same hostname and different ports are defined, migration information is not printed correctly

[yoshinorim]

From:
127.0.0.1 (current master) (sandbox master)
+--127.0.0.1 (sandbox slave1)
+--127.0.0.1 (sandbox slave2)
+--127.0.0.1 (sandbox slave3)
+--127.0.0.1 (sandbox slave4)

To:
127.0.0.1 (new master) (sandbox slave1)

Failover works correctly, but printed information is wrong, and should be fixed.

[yoshinorim]

Pushed on yoshinorim/MySQL-MasterHA-Manager@7a3c580