Expanding grpc allowed response size for 4k scale

Change-Id: Iba787473024a2ab90a1c9f6b29272bc1228b8be5
diff --git a/tests/openonu-go-adapter/Voltha_ONUReconcileTests.robot b/tests/openonu-go-adapter/Voltha_ONUReconcileTests.robot
index 9b4ab93..ee47082 100755
--- a/tests/openonu-go-adapter/Voltha_ONUReconcileTests.robot
+++ b/tests/openonu-go-adapter/Voltha_ONUReconcileTests.robot
@@ -475,7 +475,7 @@
     FOR  ${onu_device_id}  IN  @{onu_device_id_list}
         Log  ${onu_device_id}
         ${rc}    ${output}=    Run and Return Rc and Output
-        ...    voltctl -c ${VOLTCTL_CONFIG} device flows ${onu_device_id} -m 8MB -o json
+        ...    voltctl -c ${VOLTCTL_CONFIG} device flows ${onu_device_id} -m 32MB -o json
         Should Be Equal As Integers    ${rc}    0
         ${jsondata}=    To Json    ${output}
         Log    ${jsondata}