openOnu Reconcile: check etcd data are empty in test teardown

Change-Id: I5f10bfe1b8c226400d5a2dd3dfb3ab27d9c052a2
diff --git a/tests/openonu-go-adapter/Voltha_ONUReconcileTests.robot b/tests/openonu-go-adapter/Voltha_ONUReconcileTests.robot
index 61ed93f..c63d46e 100755
--- a/tests/openonu-go-adapter/Voltha_ONUReconcileTests.robot
+++ b/tests/openonu-go-adapter/Voltha_ONUReconcileTests.robot
@@ -220,6 +220,8 @@
     Run Keyword If    ${teardown_device}    Delete All Devices and Verify
     # delete etcd MIB Template Data
     Delete MIB Template Data
+    # check etcd data are empty
+    Validate Onu Data In Etcd    0
     Sleep    5s
 
 Do Reconcile In Determined State