Fix for Throughput Shaping Timer for unexpected test break before con…

…figured time when running in kubernetes environment (#669)

plugins/tst/src/main/java/kg/apc/jmeter/timers/VariableThroughputTimer.java

@@ -85,7 +85,7 @@ public VariableThroughputTimer() {
      */
     public synchronized long delay() {
         while (true) {
-            long curTimeMs = System.currentTimeMillis();
+            long curTimeMs = System.nanoTime() / 1_000_000;
             long millisSinceLastSecond = curTimeMs % 1000;
             long nowInMsRoundedAtSec = curTimeMs - millisSinceLastSecond;
             checkNextSecond(nowInMsRoundedAtSec);