Use default timeout of 360s for establising connection from voltha to olt

Change-Id: Id1506463dcdc36ad3ea0ebb5d2850944092b82e7
(cherry picked from commit fb179b7baae0c792293de4e87e09c6a02d9fbc0b)
diff --git a/tests/functional/Voltha_ErrorScenarios.robot b/tests/functional/Voltha_ErrorScenarios.robot
index ac18520..8595db8 100644
--- a/tests/functional/Voltha_ErrorScenarios.robot
+++ b/tests/functional/Voltha_ErrorScenarios.robot
@@ -69,7 +69,6 @@
     Run Keyword and Ignore Error   Collect Logs
     ${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
     ...    ${olt_device_id}
     ${rc}    ${output}=    Run and Return Rc and Output