[VOL-4355] Fixed hardcoded namespace values

Change-Id: I90894ab10ddcb57d9b59123479240fc9c3c7d967
diff --git a/tests/functional/Voltha_FailureScenarios.robot b/tests/functional/Voltha_FailureScenarios.robot
index cfae5ee..df92503 100755
--- a/tests/functional/Voltha_FailureScenarios.robot
+++ b/tests/functional/Voltha_FailureScenarios.robot
@@ -43,8 +43,7 @@
 ${VOLTHA_POD_NUM}    8
 ${NAMESPACE}      voltha
 ${STACK_NAME}       voltha
-${DEFAULTSPACE}      default
-${INFRA_NAMESPACE}    infra
+${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