**Describe the bug**
ClickHouse doesn't return affected rows via MySQL protocol for INSERT queries after 20.5+

**How to reproduce**
i create clear docker-compose environment for reproduce behavior MySQL + clickhouse + php + python
https://gist.github.com/Slach/aa67440ce856a3a53f64f92eeddfbc1b

**Queries to run that lead to unexpected result**
```
INSERT INTO default.t1(n) SELECT * FROM numbers(1000)
```

**Expected behavior**
MySQL protocol shall return affected rows field for INSERT queries (it works successful in 20.3 and 20.4)
![image](https://user-images.githubusercontent.com/105560/97867431-aa22ae00-1d2f-11eb-8caf-05431ffd29b3.png)

**Actual behavior**
![image](https://user-images.githubusercontent.com/105560/97867401-9f681900-1d2f-11eb-93cc-5ae6f1f5981b.png)
{
    packet_endpoint->sendPacket(OKPacket(0x0, client_capability_flags, 0, 0, 0), true);
}
static bool isFederatedServerSetupSetCommand(const String & query);
void MySQLHandler::comQuery(ReadBuffer & payload)
{
    String query = String(payload.position(), payload.buffer().end());
    
    
    if (isFederatedServerSetupSetCommand(query))
    {
        packet_endpoint->sendPacket(OKPacket(0x00, client_capability_flags, 0, 0, 0), true);
    }
    else
    {
        String replacement_query;
        bool should_replace = false;
        bool with_output = false;
        for (auto const & x : replacements)
        {
            if (0 == strncasecmp(x.first.c_str(), query.c_str(), x.first.size()))