many improvements with options and noop stuff

* add many options helpers
* fix noop client to allow publish messages to topic in broker
* fix noop server to allow registering in registry
* fix noop server to allow subscribe to topic in broker
* fix new service initialization

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

codec/json/json.go

@@ -25,12 +25,13 @@ func (c *Codec) ReadBody(b interface{}) error {
 	if b == nil {
 		return nil
 	}
-	if pb, ok := b.(proto.Message); ok {
+	switch m := b.(type) {
+	case proto.Message:
 		buf, err := ioutil.ReadAll(c.Conn)
 		if err != nil {
 			return err
 		}
-		return jsonpb.Unmarshal(buf, pb)
+		return jsonpb.Unmarshal(buf, m)
 	}
 	return c.Decoder.Decode(b)
 }