bugfix: in redis 2.8, delete key but convert the returned reply failed. see #227

src/redis-shake/common/utils.go

@@ -842,7 +842,7 @@ RESTORE:
 				if conf.Options.TargetReplace {
 					params = append(params, "REPLACE")
 				} else {
-					_, err = redigo.String(c.Do("del", e.Key))
+					_, err = redigoCluster.Int(c.Do("del", e.Key))
 					if err != nil {
 						log.Panicf("delete key[%v] failed[%v]", string(e.Key), err)
 					}