broker: refactor (#396)

* remove subscribe from server
* remove publish from client
* broker package refactoring

Co-authored-by: vtolstov <vtolstov@users.noreply.github.com>
Reviewed-on: #396
Co-authored-by: Vasiliy Tolstov <v.tolstov@unistack.org>
Co-committed-by: Vasiliy Tolstov <v.tolstov@unistack.org>

server/registry.go

@@ -77,10 +77,6 @@ func NewRegisterService(s Server) (*register.Service, error) {
 	}
 	node.Metadata = metadata.Copy(opts.Metadata)
 
-	node.Metadata["server"] = s.String()
-	node.Metadata["broker"] = opts.Broker.String()
-	node.Metadata["register"] = opts.Register.String()
-
 	return &register.Service{
 		Name:    opts.Name,
 		Version: opts.Version,