[VOL-2869] Verify Zero ONOS Flows Count on OLT Delete

Change-Id: I2aaec2c4a2c467ca8bfab3d0d3da8d7437fb2c10
diff --git a/tests/dt-workflow/Voltha_DT_PODTests.robot b/tests/dt-workflow/Voltha_DT_PODTests.robot
index 431a1f7..3e06882 100644
--- a/tests/dt-workflow/Voltha_DT_PODTests.robot
+++ b/tests/dt-workflow/Voltha_DT_PODTests.robot
@@ -240,6 +240,8 @@
     # Delete OLT and Validate Empty Device List
     Delete Device    ${olt_device_id}
     Run Keyword And Continue On Failure    Wait Until Keyword Succeeds    ${timeout}    5s    Test Empty Device List
+    Run Keyword And Continue On Failure    Wait Until Keyword Succeeds    ${timeout}    5s
+    ...    Verify Device Flows Removed    ${ONOS_SSH_IP}    ${ONOS_SSH_PORT}    ${of_id}
     Run Keyword and Ignore Error    Collect Logs
     # Re-do Setup (Recreate the OLT) and Perform Sanity Test DT
     Run Keyword    Setup