Fix 'MovingAverage' timeout adjuster and add tests
Fix 'MovingAverage' timeout adjuster and add tests


Former-commit-id: e1b38e391b7403648eeddfda85c2ae80ac128854
exonum/exonum,alekseysidorov/exonum,alekseysidorov/exonum,alekseysidorov/exonum,exonum/exonum,exonum/exonum,alekseysidorov/exonum,exonum/exonum