The 'restart' option of the init script cannot restart CH if it was not able to shutdown in `shutdown_wait_unfinished` seconds.
```
# sudo /etc/init.d/clickhouse-server restart
/var/run/clickhouse-server/clickhouse-server.pid file exists and contains pid = 14388.
The process with pid = 14388 is running.
Sent terminate signal to process with pid 14388.
Waiting for server to stop
/var/run/clickhouse-server/clickhouse-server.pid file exists and contains pid = 14388.
The process with pid = 14388 is running.
Waiting for server to stop
...
/var/run/clickhouse-server/clickhouse-server.pid file exists and contains pid = 14388.
Waiting for server to stop
/var/run/clickhouse-server/clickhouse-server.pid file exists and contains pid = 14388.
Waiting for server to stop
...
/var/run/clickhouse-server/clickhouse-server.pid file exists and contains pid = 14388.
Will terminate forcefully.
Code: 425, e.displayText() = DB::ErrnoException: Cannot send kill signal, errno: 3, strerror: No such process (version 21.1.3.32 (official build))
```
The log:
```
2021.02.08 18:57:23.999226 [ 14388 ] {} <Information> Application: Closed connections. But 3 remain. Tip: To increase wait time add to config: <shutdown_wait_unfinished>60</shutdown_wait_unfinished>
2021.02.08 18:57:24.016684 [ 14388 ] {} <Information> Application: Will shutdown forcefully.
2021.02.08 18:58:28.478835 [ 23658 ] {} <Information> Application: Will watch for the process with pid 23659
2021.02.08 18:58:28.478962 [ 23659 ] {} <Information> Application: Forked a child process to watch
2021.02.08 18:58:28.479067 [ 23659 ] {} <Information> StatusFile: Status file /var/run/clickhouse-server/clickhouse-server.pid already exists - unclean restart. Contents: 14388
2021.02.08 18:58:28.479147 [ 23659 ] {} <Information> SentryWriter: Sending crash reports is disabled
2021.02.08 18:58:28.479183 [ 23659 ] {} <Trace> Pipe: Pipe capacity is 1.00 MiB
2021.02.08 18:58:28.532977 [ 23659 ] {} <Information> : Starting ClickHouse 21.1.3.32 with revision 54445, build id: 63BC1671E8C217170F9B6C6346099FD1F76E784F, PID 23659
2021.02.08 18:58:28.533059 [ 23659 ] {} <Information> Application: starting up
```

fs::create_directories(ulimits_dir);
                WriteBufferFromFile out(ulimits_file.string());
                out.write(ulimits_content.data(), ulimits_content.size());
                out.sync();
                out.finalize();
            }
            catch (...)
            {
                std::cerr << "Cannot set ulimits: " << getCurrentExceptionMessage(false) << "\n";
            }
            
        }
        else
            fmt::print("Will not create clickhouse user.\n");
        
        fs::path config_dir = prefix / options["config-path"].as<std::string>();
        if (!fs::exists(config_dir))
        {
            fmt::print("Creating config directory {}.\n", config_dir.string());
            fs::create_directories(config_dir);
        }
        fs::path main_config_file = config_dir / "config.xml";
        fs::path users_config_file = config_dir / "users.xml";
        fs::path config_d = config_dir / "config.d";
        fs::path users_d = config_dir / "users.d";
        std::string log_path = prefix / options["log-path"].as<std::string>();
        std::string data_path = prefix / options["data-path"].as<std::string>();
        std::string pid_path = prefix / options["pid-path"].as<std::string>();
        bool has_password_for_default_user = false;
        if (!fs::exists(config_d))