code: def find_srvs_by_hostname(self, host_name):
          
          if hasattr(self, 'hosts'):
              host = self.hosts.find_by_name(host_name)
              if host is None:
                  return None
              return host.get_services()
          return None
docs: Get all services from a host based on a host_name
  
          :param host_name: the host name we want services
          :type host_name: str
          :return: list of services
          :rtype: list[alignak.objects.service.Service]