Fix time based average stats (#442)

* keep track of current stats and zero them after updating averages

* Try tests

* typo

* remove commented test stuff

* Avoid dividing by zero

* Fix test

* refactor, get rid of iterator. do it manually

* trigger build

* Fix

src/stats.rs

@@ -113,6 +113,7 @@ impl Collector {
                 for stats in server_stats.values() {
                     if !stats.check_address_stat_average_is_updated_status() {
                         stats.address_stats().update_averages();
+                        stats.address_stats().reset_current_counts();
                         stats.set_address_stat_average_is_updated_status(true);
                     }
                 }