Allow for flows, schedulers and queues to be deleted before deleting
ONU post volt-remove-subscriber-access command.

Change-Id: I8972ac45d77a150eb5e8611a7e9d0df52c1f4438
diff --git a/tests/dt-workflow/Voltha_DT_FailureScenarios.robot b/tests/dt-workflow/Voltha_DT_FailureScenarios.robot
index 7f729e8..12110a9 100755
--- a/tests/dt-workflow/Voltha_DT_FailureScenarios.robot
+++ b/tests/dt-workflow/Voltha_DT_FailureScenarios.robot
@@ -96,6 +96,8 @@
         # Remove Subscriber Access (To replicate DT workflow)
         Wait Until Keyword Succeeds    ${timeout}    2s    Execute ONOS CLI Command use single connection    ${ONOS_SSH_IP}
         ...    ${ONOS_SSH_PORT}    volt-remove-subscriber-access ${of_id} ${onu_port}
+        # Allow the remove subscriber command to clean up all the flows, schedulers and queues before deleting the device
+        Sleep    5s
         # Delete ONU Device (To replicate DT workflow)
         Delete Device    ${onu_device_id}
         Sleep    5s