Apply packetLoss also to up interface (#69)

If should work (tested running `tc` manually) as already done with the `down` interface.

Author: vpalmisano

lib/tc.js

@@ -118,7 +118,7 @@ async function setLimits(up, down, halfWayRTT, packetLoss, indexFace) {
     await sudo.apply(this, parameters);
   }
   if (up) {
-    await sudo(
+    const params = [
       'tc',
       'qdisc',
       'add',
@@ -132,7 +132,13 @@ async function setLimits(up, down, halfWayRTT, packetLoss, indexFace) {
       `${halfWayRTT}ms`,
       'rate',
       `${up}kbit`
-    );
+    ];
+
+    if (packetLoss) {
+      params.push('loss', `${packetLoss}%`);
+    }
+
+    await sudo.apply(this, params);
   }
 
   if (!up && !down && halfWayRTT > 0) {