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/functional_test/tests/delete_single_monitored_device.expected b/demo_test/functional_test/tests/delete_single_monitored_device.expected
new file mode 100644
index 0000000..04eaa99
--- /dev/null
+++ b/demo_test/functional_test/tests/delete_single_monitored_device.expected
@@ -0,0 +1,16 @@
+// Copyright 2018 Open Networking Foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+ip1:port1 attached
+ip1:port1 deleted
+Device ip1:port1 not found