VOL-3735 Retrieve port counters using the GetExtValue(SingleGetValue) rpc from the openolt adapter

Change-Id: I6bce9eb07396fb84e6733beeb81341080243e7a5
diff --git a/go.sum b/go.sum
index 6fd9747..a2ccf29 100644
--- a/go.sum
+++ b/go.sum
@@ -231,12 +231,11 @@
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