Issue with OLT reboot fixture

Change-Id: Ic6cf6675e8453c3cdaf8512c4bba69160916dd22
(cherry picked from commit 44219d088d30f415794a104e084b702220234cf9)
diff --git a/tests/functional/Voltha_FailureScenarios.robot b/tests/functional/Voltha_FailureScenarios.robot
index d54076e..b7adf70 100644
--- a/tests/functional/Voltha_FailureScenarios.robot
+++ b/tests/functional/Voltha_FailureScenarios.robot
@@ -161,6 +161,9 @@
     # Wait for the OLT to come back up
     Run Keyword If    ${has_dataplane}    Wait Until Keyword Succeeds    120s    10s
     ...    Check Remote System Reachability    True    ${olt_ssh_ip}
+    Run Keyword And Continue On Failure    Wait Until Keyword Succeeds    360s    5s
+    ...    Validate OLT Device    ENABLED    ACTIVE
+    ...    REACHABLE    ${olt_serial_number}
     # Waiting extra time for the ONUs to come up
     Sleep    60s
     Run Keyword And Ignore Error    Collect Logs