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/common_test.go

@@ -15,10 +15,16 @@ var (
 					{
 						Id:      "foo-1.0.0-123",
 						Address: "localhost:9999",
+						Metadata: map[string]string{
+							"protocol": "mucp",
+						},
 					},
 					{
 						Id:      "foo-1.0.0-321",
 						Address: "localhost:9999",
+						Metadata: map[string]string{
+							"protocol": "mucp",
+						},
 					},
 				},
 			},
@@ -29,6 +35,9 @@ var (
 					{
 						Id:      "foo-1.0.1-321",
 						Address: "localhost:6666",
+						Metadata: map[string]string{
+							"protocol": "mucp",
+						},
 					},
 				},
 			},
@@ -39,6 +48,9 @@ var (
 					{
 						Id:      "foo-1.0.3-345",
 						Address: "localhost:8888",
+						Metadata: map[string]string{
+							"protocol": "mucp",
+						},
 					},
 				},
 			},