[VOL-3999] Restarting port-forward after restarting VOLTHA-core
component
 Adding explicit error messages for ONOS App upgrade test

Change-Id: I80a2c56dfd26d88d2494d89c67990eb4697fd55c
diff --git a/tests/software-upgrades/Voltha_ComponentsUpgrade.robot b/tests/software-upgrades/Voltha_ComponentsUpgrade.robot
index 369f9b0..30016a7 100755
--- a/tests/software-upgrades/Voltha_ComponentsUpgrade.robot
+++ b/tests/software-upgrades/Voltha_ComponentsUpgrade.robot
@@ -101,6 +101,7 @@
         ${pod_image_1}    ${app_ver_1}    ${helm_chart_1}    Get Pod Image And App Version And Helm Chart By Label
         ...    ${NAMESPACE}    app    ${label}
         Log    ${label}: image, app ver & helm chart after upgrade: ${pod_image_1}, ${app_ver_1} & ${helm_chart_1}
+        Restart VOLTHA Port Forward     voltha-api
         Wait Until Keyword Succeeds    ${timeout}    2s    Perform Sanity Test     ${suppressaddsubscriber}
     END
     ${podStatusOutput}=    Run    kubectl get pods -n ${NAMESPACE}