[VOL-4355] Fixed hardcoded namespace values

Change-Id: I90894ab10ddcb57d9b59123479240fc9c3c7d967
diff --git a/tests/functional/Voltha_PODTests.robot b/tests/functional/Voltha_PODTests.robot
index f58f9b3..11f47a1 100755
--- a/tests/functional/Voltha_PODTests.robot
+++ b/tests/functional/Voltha_PODTests.robot
@@ -42,6 +42,7 @@
 ${HELM_CHARTS_DIR}    ~/helm-charts
 ${VOLTHA_POD_NUM}    8
 ${NAMESPACE}      voltha
+${INFRA_NAMESPACE}      default
 # For below variable value, using deployment name as using grep for
 # parsing radius pod name, we can also use full radius pod name
 ${RESTART_POD_NAME}    radius