Revert "VOL-4125: Respond with success/failure to flow insertion according the"

This reverts commit d38fe683afd8a7f43041b60365cc83e8eaa640ee.

Reason for revert: corresponding patch is not yet merged and tests are failing

Change-Id: I00615e62b413ae80c11b6a76babea704be3a192c
diff --git a/libraries/utils.robot b/libraries/utils.robot
index 53b6796..793662d 100755
--- a/libraries/utils.robot
+++ b/libraries/utils.robot
@@ -828,7 +828,7 @@
         ...    Run Keywords
         ...    Run Keyword And Continue On Failure    Wait Until Keyword Succeeds    ${timeout}    5s
         ...    Validate Device    ENABLED    DISCOVERED
-        ...    UNREACHABLE    ${src['onu']}    onu=True    onu_reason=stopping-openomci
+        ...    UNREACHABLE    ${src['onu']}    onu=True    onu_reason=omci-flows-deleted
         ...    AND    Run Keyword And Continue On Failure    Wait Until Keyword Succeeds   ${timeout}    2s
         ...    Verify UNI Port Is Disabled   ${ONOS_SSH_IP}    ${ONOS_SSH_PORT}    ${src['onu']}    ${src['uni_id']}
         ...    AND    Run Keyword If    ${has_dataplane}    Run Keyword And Continue On Failure