[VOL-4359] Added ETCD data cleanup verification after device delete

Change-Id: Ic3e3eced67826c6c7277cc8c21f0e6241b7e9a0b
diff --git a/tests/functional/Voltha_FailureScenarios2.robot b/tests/functional/Voltha_FailureScenarios2.robot
index 137fc9b..fb444c6 100755
--- a/tests/functional/Voltha_FailureScenarios2.robot
+++ b/tests/functional/Voltha_FailureScenarios2.robot
@@ -41,6 +41,7 @@
 ${HELM_CHARTS_DIR}    ~/helm-charts
 ${VOLTHA_POD_NUM}    8
 ${NAMESPACE}      voltha
+${INFRA_NAMESPACE}      default
 ${DEFAULTSPACE}      default
 # For below variable value, using deployment name as using grep for
 # parsing radius pod name, we can also use full radius pod name