docs: def get_host_port_names(self, host_name):
          """ return a list of the port names of XIV host """
          port_names = list()
          host = self.get_hosts_by_name(host_name)
          fc_ports = host.fc_ports
          iscsi_ports = host.iscsi_ports
          port_names.extend(fc_ports.split(',') if fc_ports != '' else [])
          port_names.extend(iscsi_ports.split(',') if iscsi_ports != '' else [])
          return port_names