'Take a host_id and a host_iter. Changes the string representation
of the host in the model. Potentially slow, makes a request to the server.
Return None.
@precondtions: host_iter must be in self.model'

def _update_single_host_name_in_model(self, host_id, host_iter):

    host = self.get_single_host_function(host_id)
    new_name = host.getName()
    vuln_amount = self._get_vuln_amount_from_model(host_iter)
    new_string = '{0}    ({1})'.format(new_name, vuln_amount)
    self.model.set_value(host_iter, 3, new_string)
