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/demo_test/vendor/github.com/Shopify/sarama/config_resource_type.go b/demo_test/vendor/github.com/Shopify/sarama/config_resource_type.go
new file mode 100644
index 0000000..bef1053
--- /dev/null
+++ b/demo_test/vendor/github.com/Shopify/sarama/config_resource_type.go
@@ -0,0 +1,18 @@
+package sarama
+
+// ConfigResourceType is a type for resources that have configs.
+type ConfigResourceType int8
+
+// Taken from:
+// https://github.com/apache/kafka/blob/ed7c071e07f1f90e4c2895582f61ca090ced3c42/clients/src/main/java/org/apache/kafka/common/config/ConfigResource.java#L32-L55
+
+const (
+	// UnknownResource constant type
+	UnknownResource ConfigResourceType = 0
+	// TopicResource constant type
+	TopicResource ConfigResourceType = 2
+	// BrokerResource constant type
+	BrokerResource ConfigResourceType = 4
+	// BrokerLoggerResource constant type
+	BrokerLoggerResource ConfigResourceType = 8
+)