Updated onu-reason for disabled onu in DT test

Change-Id: I42f28173bb942acb72344debafdbaae7bcc21ffc
diff --git a/tests/dt-workflow/Voltha_DT_PODTests.robot b/tests/dt-workflow/Voltha_DT_PODTests.robot
index d5bb073..5171720 100755
--- a/tests/dt-workflow/Voltha_DT_PODTests.robot
+++ b/tests/dt-workflow/Voltha_DT_PODTests.robot
@@ -233,7 +233,7 @@
         Disable Device    ${onu_device_id}
         Run Keyword And Continue On Failure    Wait Until Keyword Succeeds    ${timeout}    5s
         ...    Validate Device    DISABLED    UNKNOWN
-        ...    REACHABLE    ${src['onu']}    onu=True    onu_reason=omci-admin-lock
+        ...    REACHABLE    ${src['onu']}    onu=True    onu_reason=tech-profile-config-delete-success
         Wait Until Keyword Succeeds   ${timeout}    2s
         ...    Verify UNI Port Is Disabled   ${ONOS_SSH_IP}    ${ONOS_SSH_PORT}    ${src['onu']}
         # TODO: Yet to Verify on the GPON based Physical POD (VOL-2652)