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

Change-Id: Ic3e3eced67826c6c7277cc8c21f0e6241b7e9a0b
diff --git a/tests/bbsim/Voltha_BBSimTests.robot b/tests/bbsim/Voltha_BBSimTests.robot
index ef185f9..5cf1cbf 100755
--- a/tests/bbsim/Voltha_BBSimTests.robot
+++ b/tests/bbsim/Voltha_BBSimTests.robot
@@ -34,6 +34,7 @@
 
 *** Variables ***
 ${NAMESPACE}      voltha
+${INFRA_NAMESPACE}      default
 ${timeout}        60s
 ${of_id}          0
 ${logical_id}     0