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

client/grpc/grpc_test.go

@@ -45,6 +45,9 @@ func TestGRPCClient(t *testing.T) {
 			{
 				Id:      "test-1",
 				Address: l.Addr().String(),
+				Metadata: map[string]string{
+					"protocol": "grpc",
+				},
 			},
 		},
 	})