rewrite WsStat case class

[Yakushev Aleksey]

We need a constructor with parameters LONG, CNT.
to eliminate code like this

 WsStat(
            currTs, 0,
            new FixedList[CacheGetElm](cfg.getcntHistoryDeep),
            new FixedList[CacheCleanElm](cfg.getcntHistoryDeep),
            new FixedList[ConnStat](cfg.getcntHistoryDeep)
          )

in def refCache

[Yakushev Aleksey]

fixed by commit - commit e058ad8