add network for node

chain/node.go

@@ -26,6 +26,7 @@ type NodeOptions struct {
 	HostMapper hosts.HostMapper
 	Metadata   metadata.Metadata
 	Host       string
+	Network    string
 	Protocol   string
 	HTTP       *HTTPNodeSettings
 	TLS        *TLSNodeSettings
@@ -64,6 +65,12 @@ func HostNodeOption(host string) NodeOption {
 	}
 }
 
+func NetworkNodeOption(network string) NodeOption {
+	return func(o *NodeOptions) {
+		o.Network = network
+	}
+}
+
 func ProtocolNodeOption(protocol string) NodeOption {
 	return func(o *NodeOptions) {
 		o.Protocol = protocol