Fixing test method name.

Author: Cristian Pop

e2e/stress/IoTClientPerf/Scenarios/DeviceClientScenario.cs

@@ -25,7 +25,7 @@ public abstract class DeviceClientScenario : PerfScenario
         private readonly TelemetryMetrics _mRecv = new TelemetryMetrics();
         private readonly Stopwatch _swRecv = new Stopwatch();
 
-        private const string TestMethodName = "SendMessageToDevice";
+        private const string TestMethodName = "PerfTestMethod";
         private readonly TelemetryMetrics _mMethod = new TelemetryMetrics();
         private readonly Stopwatch _swMethod = new Stopwatch();
         private readonly SemaphoreSlim _methodSemaphore = new SemaphoreSlim(0);