code: public function installOperatingSystem($vpsName, $operatingSystemName, $hostname)
      {
          return $this->call(self::SERVICE, 'installOperatingSystem', [$vpsName, $operatingSystemName, $hostname]);
      }
docs: Install an operating system on a VPS.
  
  @param string $vpsName             Name of the VPS
  @param string $operatingSystemName Name of the operating system
  @param string $hostname            Hostname
  
  @throws \SoapFault
  
  @return mixed