Add support for latency measurement for STL traffic

Author: ericsson-peiwuyang

src/main/java/com/cisco/trex/stateless/model/stats/LatencyStatLat.java

@@ -22,6 +22,9 @@ public class LatencyStatLat {
   @JsonProperty("total_max")
   private long totalMax = 0;
 
+  @JsonProperty("total_min")
+  private long totalMin = 0;
+
   @JsonProperty("average")
   public double getAverage() {
     return average;
@@ -71,4 +74,14 @@ public long getTotalMax() {
   public void setTotalMax(final long totalMax) {
     this.totalMax = totalMax;
   }
+
+  @JsonProperty("total_min")
+  public long getTotalMin() {
+    return totalMin;
+  }
+
+  @JsonProperty("total_min")
+  public void setTotalMin(final long totalMin) {
+    this.totalMin = totalMin;
+  }
 }