Remove WebDAV redirect from the root path

This will prevent people mounting the root path.
They should use the full webdav path instead.

Fixes #4923

lib/base.php

@@ -687,7 +687,11 @@ class OC {
 		}
 		// Handle WebDAV
 		if ($_SERVER['REQUEST_METHOD'] == 'PROPFIND') {
-			header('location: ' . OC_Helper::linkToRemote('webdav'));
+			// not allowed any more to prevent people
+			// mounting this root directly.
+			// Users need to mount remote.php/webdav instead.
+			header('HTTP/1.1 405 Method Not Allowed');
+			header('Status: 405 Method Not Allowed');
 			return;
 		}