Adding set repl-syncio-timeout in config command

Adding repl-syncio-timeout in config Command.
regardless of any other issue. I think it is better to set timeout values.

```c
redis 127.0.0.1:6379> config get repl-syncio-timeout
1) "repl-syncio-timeout"
2) "5"
```

and

```c
redis 127.0.0.1:6379> config get repl-syncio-timeout
1) "repl-syncio-timeout"
2) "3"
```