fix(e2e): add an extra nslookup when testing for advanced DNS metrics (…

…#438)

# Description
Ref: #415. Added for Basic DNS
metrics but missed for Adv DNS metrics
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test/e2e/scenarios/dns/scenarios.go

@@ -64,6 +64,7 @@ func ValidateBasicDNSMetrics(scenarioName string, req *RequestValidationParams,
 				Duration: sleepDelay,
 			},
 		},
+		// Ref: https://github.com/microsoft/retina/issues/415
 		{
 			Step: &kubernetes.ExecInPod{
 				PodName:      podName,
@@ -168,6 +169,23 @@ func ValidateAdvancedDNSMetrics(scenarioName string, req *RequestValidationParam
 				Duration: sleepDelay,
 			},
 		},
+		// Ref: https://github.com/microsoft/retina/issues/415
+		{
+			Step: &kubernetes.ExecInPod{
+				PodName:      podName,
+				PodNamespace: "kube-system",
+				Command:      req.Command,
+			},
+			Opts: &types.StepOptions{
+				ExpectError:               req.ExpectError,
+				SkipSavingParamatersToJob: true,
+			},
+		},
+		{
+			Step: &types.Sleep{
+				Duration: sleepDelay,
+			},
+		},
 		{
 			Step: &kubernetes.PortForward{
 				Namespace:             "kube-system",