[VOL-3197][VOL-3196] Enhanced Kafka RPC and gRPC interfaces to propagate Span context for log correlation

Also, made some corrections to helper method in log/utils based on testing

Change-Id: Ic0fec935dd8996b3c6c17116586c5bd307e7bebb
diff --git a/go.mod b/go.mod
index 0cc8432..fa330f5 100644
--- a/go.mod
+++ b/go.mod
@@ -19,6 +19,7 @@
 	github.com/gogo/protobuf v1.3.0
 	github.com/golang/protobuf v1.3.2
 	github.com/google/uuid v1.1.1
+	github.com/grpc-ecosystem/go-grpc-middleware v1.0.1-0.20190118093823-f849b5445de4
 	github.com/hashicorp/consul/api v1.2.0
 	github.com/hashicorp/go-immutable-radix v1.1.0 // indirect
 	github.com/hashicorp/go-msgpack v0.5.5 // indirect