Declaring up and down variables

Change-Id: I1f656c844aa99f91b1c6f5d8518a939c55a17650
diff --git a/tests/dt-workflow/Voltha_DT_PODTests.robot b/tests/dt-workflow/Voltha_DT_PODTests.robot
index be71939..a1d707e 100644
--- a/tests/dt-workflow/Voltha_DT_PODTests.robot
+++ b/tests/dt-workflow/Voltha_DT_PODTests.robot
@@ -48,6 +48,8 @@
 ${timeout}        360s
 ${of_id}          0
 ${logical_id}     0
+${uprate}         0
+${dnrate}         0
 ${has_dataplane}    True
 ${teardown_device}    True
 ${scripts}        ../../scripts