Fixing reason in DT enable/disable ONU

Change-Id: I1e1aaaf55fc31fa1284ef380a347ee8b4fa65deb
diff --git a/tests/dt-workflow/Voltha_DT_PODTests.robot b/tests/dt-workflow/Voltha_DT_PODTests.robot
index 9991d4c..eab2145 100755
--- a/tests/dt-workflow/Voltha_DT_PODTests.robot
+++ b/tests/dt-workflow/Voltha_DT_PODTests.robot
@@ -228,7 +228,7 @@
         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=tech-profile-config-delete-success
+        ...    REACHABLE    ${src['onu']}    onu=True    onu_reason=omci-admin-lock
         Wait Until Keyword Succeeds   ${timeout}    2s
         ...    Verify UNI Port Is Disabled   ${ONOS_SSH_IP}    ${ONOS_SSH_PORT}    ${src['onu']}    ${src['uni_id']}
         # TODO: Yet to Verify on the GPON based Physical POD (VOL-2652)