[#236] netmap: Remove unused field from meanIQRAgg

It was there since the inception [1], but we never got to use it.

[1] 5931284e07

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

netmap/aggregator.go

@@ -26,7 +26,6 @@ type (
 	}
 
 	meanIQRAgg struct {
-		k   float64
 		arr []float64
 	}
 
@@ -111,7 +110,6 @@ func (a *minAgg) Compute() float64 {
 }
 
 func (a *meanIQRAgg) clear() {
-	a.k = 0
 	a.arr = a.arr[:0]
 }
 
@@ -135,8 +133,7 @@ func (a *meanIQRAgg) Compute() float64 {
 		min, max = a.arr[0], a.arr[l-1]
 	} else {
 		start, end := l/minLn, l*3/minLn-1
-		iqr := a.k * (a.arr[end] - a.arr[start])
-		min, max = a.arr[start]-iqr, a.arr[end]+iqr
+		min, max = a.arr[start], a.arr[end]
 	}
 
 	count := 0