Add OLT before doing tests in ofagent restart tests for TT workflow

Change-Id: Ica714e5870dd1d38ff95f500b058e93efe669ad0
diff --git a/tests/tt-workflow/Voltha_TT_FailureScenarios.robot b/tests/tt-workflow/Voltha_TT_FailureScenarios.robot
index f1f425e..d00ed46 100755
--- a/tests/tt-workflow/Voltha_TT_FailureScenarios.robot
+++ b/tests/tt-workflow/Voltha_TT_FailureScenarios.robot
@@ -320,6 +320,9 @@
     [Teardown]    Run Keywords    Collect Logs
     ...           AND             Stop Logging    ofagentRestart-TT
     ...           AND             Scale K8s Deployment    ${NAMESPACE}    ${STACK_NAME}-voltha-ofagent    1
+    # Add OLT device
+    Setup
+    Run Keyword If    ${has_dataplane}    Clean Up Linux
     # set timeout value
     ${waitforRestart}    Set Variable    120s
     ${podStatusOutput}=    Run    kubectl get pods -n ${NAMESPACE}