[management] Add structs for new networks concept (#3006)

management/server/resource.go

@@ -0,0 +1,21 @@
+package server
+
+type ResourceType string
+
+const (
+	// nolint
+	hostType ResourceType = "Host"
+	//nolint
+	subnetType ResourceType = "Subnet"
+	// nolint
+	domainType ResourceType = "Domain"
+)
+
+func (p ResourceType) String() string {
+	return string(p)
+}
+
+type Resource struct {
+	Type ResourceType
+	ID   string
+}