The mega cruft proxy PR (#974)

* the mega cruft proxy PR

* Rename broker id

* add protocol=grpc

* fix compilation breaks

* Add the tunnel broker to the network

* fix broker id

* continue to be backwards compatible in the protocol

request.go

@@ -20,6 +20,9 @@ type rpcMessage struct {
 	topic       string
 	contentType string
 	payload     interface{}
+	header      map[string]string
+	body        []byte
+	codec       codec.Codec
 }
 
 func (r *rpcRequest) ContentType() string {
@@ -73,3 +76,15 @@ func (r *rpcMessage) Topic() string {
 func (r *rpcMessage) Payload() interface{} {
 	return r.payload
 }
+
+func (r *rpcMessage) Header() map[string]string {
+	return r.header
+}
+
+func (r *rpcMessage) Body() []byte {
+	return r.body
+}
+
+func (r *rpcMessage) Codec() codec.Reader {
+	return r.codec
+}