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/go.mod b/demo_test/go.mod
new file mode 100644
index 0000000..60b161b
--- /dev/null
+++ b/demo_test/go.mod
@@ -0,0 +1,14 @@
+module github.com/opencord/device-management/demo_test
+
+go 1.13
+
+require (
+	github.com/Shopify/sarama v1.26.1
+	github.com/golang/protobuf v1.4.0
+	github.com/jessevdk/go-flags v1.4.0
+	github.com/sirupsen/logrus v1.5.0
+	golang.org/x/net v0.0.0-20200425230154-ff2c4b7c35a0
+	google.golang.org/genproto v0.0.0-20190927181202-20e1ac93f88c // indirect
+	google.golang.org/grpc v1.29.1
+	gopkg.in/yaml.v2 v2.2.8
+)