SEBA-902 single-olt tests;
Pin protoc-gen-go to 1.3.2 to resolve compatibility issue;
Run go mod tidy / go mod vendor on importer;
Add Go Module support to demotest

Change-Id: Ifde824fc9a6317b0adc1e12bea54ee1f9b788906
diff --git a/vendor/github.com/Shopify/sarama/go.sum b/vendor/github.com/Shopify/sarama/go.sum
index 7f61258..06ec328 100644
--- a/vendor/github.com/Shopify/sarama/go.sum
+++ b/vendor/github.com/Shopify/sarama/go.sum
@@ -1,69 +1,81 @@
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