Webdav: fully implements the controller and response

The controller is tested from real request scraped from apache mod_dav implementation. The requests were scraped using a wireshark-like tool. Those requests have been adapted to suit to our xml.

utils/http/docstore/http-client.env.json

@@ -0,0 +1,6 @@
+{
+    "dev": {
+        "host": "localhost:8001",
+        "uuid": "0bf3b8e7-b25b-4227-aae9-a3263af0766f"
+    }
+}