relayprioritizer: remove asserts on hard-coded values

                freshness = result.time - oldest_allowed

                if isinstance(result, ResultError) \

                    and prioritize_result_error is True:

                    # Reduce the freshness for results containing errors so

                    # that they are not de-prioritized as much. This way, we

                    # will come back to them sooner to try again.

                    assert result.freshness_reduction_factor >= 0.0

                    assert result.freshness_reduction_factor <= 1.0

                    log.debug('Cutting freshness for a %s result by %d%% for '

                              '%s', result.type.value,

                              result.freshness_reduction_factor * 100,

                              relay.nickname)

                    # result.freshness_reduction_factor are hard-coded values

                    # on how much prioritize measurements that failed

                    # depending on the type of error.

                    # In a future refactor, create these values on an algorithm

                    # or create constants.

                    freshness *= max(1.0-result.freshness_reduction_factor, 0)

                priority += freshness

            relay.priority = priority