rename api3 back to api2

There is no real need to change the path, so using api2 we can reuse
all helpers (like tools from proxmox widget toolkit).

src/api2/admin.rs

@@ -0,0 +1,18 @@
+use crate::api::schema::*;
+use crate::api::router::*;
+use serde_json::{json};
+
+pub mod datastore;
+
+pub fn router() -> Router {
+
+    let route = Router::new()
+        .get(ApiMethod::new(
+            |_,_| Ok(json!([
+                {"subdir": "datastore"}
+            ])),
+            ObjectSchema::new("Directory index.")))
+        .subdir("datastore", datastore::router());
+
+    route
+}