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

Change-Id: I195f7c9fdc4b677c333ae9e4bb3547bb95312fdf
diff --git a/go.sum b/go.sum
index bc2c312..5c8292d 100644
--- a/go.sum
+++ b/go.sum
@@ -202,12 +202,11 @@
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