increase timeout for Validate OLT step, for debug

Change-Id: Ie34d514cee6963a6d050d02b3890faa92704eeec
diff --git a/tests/functional/Voltha_ErrorScenarios.robot b/tests/functional/Voltha_ErrorScenarios.robot
index 93de819..29f88cd 100644
--- a/tests/functional/Voltha_ErrorScenarios.robot
+++ b/tests/functional/Voltha_ErrorScenarios.robot
@@ -67,6 +67,7 @@
     Run Keyword If    ${has_dataplane}    Delete Device and Verify
     ${olt_device_id}=    Create Device    ${olt_ip}    ${OLT_PORT}
     Set Suite Variable    ${olt_device_id}
+    ${timeout}    Set Variable    180s
     Wait Until Keyword Succeeds    ${timeout}    5s    Validate OLT Device    PREPROVISIONED    UNKNOWN    UNKNOWN
     ...    ${EMPTY}    ${olt_device_id}
     ${rc}    ${output}=    Run and Return Rc and Output