fix consistent hashing, both MD5 and Murmur,

src/main/java/redis/clients/jedis/JedisShardInfo.java

@@ -19,10 +19,8 @@ import redis.clients.util.ShardInfo;
 import redis.clients.util.Sharded;
 
 public class JedisShardInfo extends ShardInfo<Jedis> {
-    @Override
     public String toString() {
-        return "JedisShardInfo [host=" + host + ", port=" + port + ", weight="
-                + getWeight() + "]";
+        return host + ":" + port + "*" + getWeight();
     }
 
     private int timeout;