[VOL-4267] Re-enabled RestartOpenOnuPingDt and RestartOpenOltPingDt scenarios with some modifications

Change-Id: Ie6098140524c3d2f5a9c9720e743b47d7824c480
diff --git a/libraries/utils.robot b/libraries/utils.robot
index 1c3b9ae..adcd9b2 100755
--- a/libraries/utils.robot
+++ b/libraries/utils.robot
@@ -1337,7 +1337,7 @@
     ...    ${container_type}=${None}    ${container_name}=${None}
     [Documentation]    Runs the 'ping' on remote system in background and stores the result in a file
     ${result}=    Login And Run Command On Remote System
-    ...    ping -I ${iface} ${dst_ip} > ${output_file} &
+    ...    echo "ping -I ${iface} ${dst_ip} > ${output_file} &" > ping.sh; chmod +x ping.sh; ./ping.sh
     ...    ${ip}    ${user}    ${pass}    ${container_type}    ${container_name}
     Log    ${result}
 
diff --git a/tests/dt-workflow/Voltha_DT_FailureScenarios.robot b/tests/dt-workflow/Voltha_DT_FailureScenarios.robot
index 5233544..4f9ce58 100755
--- a/tests/dt-workflow/Voltha_DT_FailureScenarios.robot
+++ b/tests/dt-workflow/Voltha_DT_FailureScenarios.robot
@@ -562,7 +562,7 @@
     [Documentation]    Restart openonu-adapter container after VOLTHA is operational.
     ...    Run the ping continuously in background during container restart,
     ...    and verify that there should be no affect on the dataplane.
-    [Tags]    functionalDt    RestartOpenOnuPingDt    non-critical    notready
+    [Tags]    functionalDt    RestartOpenOnuPingDt    non-critical
     [Setup]    Start Logging    RestartOpenOnuPingDt
     [Teardown]    Run Keywords    Run Keyword If    ${logging}    Collect Logs
     ...           AND             Stop Logging    RestartOpenOnuPingDt
@@ -615,7 +615,7 @@
     [Documentation]    Restart openolt-adapter container after VOLTHA is operational.
     ...    Run the ping continuously in background during container restart,
     ...    and verify that there should be no affect on the dataplane.
-    [Tags]    functionalDt    RestartOpenOltPingDt    non-critical    notready
+    [Tags]    functionalDt    RestartOpenOltPingDt    non-critical
     [Setup]    Start Logging    RestartOpenOltPingDt
     [Teardown]    Run Keywords    Run Keyword If    ${logging}    Collect Logs
     ...           AND             Stop Logging    RestartOpenOltPingDt