Add vfolder id parameter when deleting vfolder

* Needed for delete vfolder by superadmin.

Author: adrysn

src/ai/backend/client/vfolder.py

@@ -73,8 +73,10 @@ async def info(self):
             return await resp.json()
 
     @api_function
-    async def delete(self):
+    async def delete(self, oid=None):
         rqst = Request(self.session, 'DELETE', '/folders/{0}'.format(self.name))
+        if oid is not None:
+            rqst.set_json({'id': oid})
         async with rqst.fetch():
             return {}