Advertise and update node names on cluster config exchange

Closes #244

protocol/message.go

@@ -98,6 +98,15 @@ type ClusterConfigMessage struct {
 	Options       []Option     // max:64
 }
 
+func (o *ClusterConfigMessage) GetOption(key string) string {
+	for _, option := range o.Options {
+		if option.Key == key {
+			return option.Value
+		}
+	}
+	return ""
+}
+
 type Repository struct {
 	ID    string // max:64
 	Nodes []Node // max:64