[VOL-4290] Voltha go library updates for gRPC migration

Change-Id: I1aa2774beb6b7ed7419bc45aeb53fcae8a8ecda0
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/go.mod b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/go.mod
new file mode 100644
index 0000000..7dc62e5
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/go.mod
@@ -0,0 +1,22 @@
+module github.com/grpc-ecosystem/go-grpc-middleware
+
+require (
+	github.com/go-kit/kit v0.9.0
+	github.com/go-logfmt/logfmt v0.4.0 // indirect
+	github.com/go-stack/stack v1.8.0 // indirect
+	github.com/gogo/protobuf v1.3.2
+	github.com/golang/protobuf v1.3.3
+	github.com/opentracing/opentracing-go v1.1.0
+	github.com/pkg/errors v0.8.1 // indirect
+	github.com/sirupsen/logrus v1.4.2
+	github.com/stretchr/testify v1.4.0
+	go.uber.org/atomic v1.4.0 // indirect
+	go.uber.org/multierr v1.1.0 // indirect
+	go.uber.org/zap v1.10.0
+	golang.org/x/net v0.0.0-20201021035429-f5854403a974
+	golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be
+	google.golang.org/genproto v0.0.0-20200423170343-7949de9c1215 // indirect
+	google.golang.org/grpc v1.29.1
+)
+
+go 1.14