**Use case**

It prints:
```
ClickHouse has been successfully installed.

Start clickhouse-server with:
 sudo clickhouse start
```

But if clickhouse-server is already running, let's print:
```
ClickHouse has been successfully installed.

Restart clickhouse-server with:
 sudo clickhouse restart
```
#include <IO/ReadBufferFromFileDescriptor.h>
#include <IO/WriteBufferFromFileDescriptor.h>
#include <IO/ReadBufferFromFile.h>
#include <IO/WriteBufferFromFile.h>
#include <IO/MMapReadBufferFromFile.h>
#include <IO/ReadBufferFromMemory.h>
#include <IO/copyData.h>
#include <IO/Operators.h>
#include <readpassphrase.h>
#include <Poco/Util/XMLConfiguration.h>
/** This tool can be used to install ClickHouse without a deb/rpm/tgz package, having only "clickhouse" binary.
  * It also allows to avoid dependency on systemd, upstart, SysV init.
  *
  * The following steps are performed:
  *
  * - copying the binary to binary directory (/usr/bin).
  * - creation of symlinks for tools.
  * - creation of clickhouse user and group.
  * - creation of config directory (/etc/clickhouse-server).
  * - creation of default configuration files.
  * - creation of a directory for logs (/var/log/clickhouse-server).
  * - creation of a data directory if not exists.
  * - setting a password for default user.
  * - choose an option to listen connections.
  * - changing the ownership and mode of the directories.
  * - setting capabilities for binary.
  * - setting ulimits for the user.
  * - (todo) put service in cron.
  *
  * It does not install clickhouse-odbc-bridge.