plugin XEP-0363: register namespace

sat/plugins/plugin_xep_0363.py

@@ -102,6 +102,8 @@ class XEP_0363:
         )
         # list of callbacks used when a request is done to a component
         self.handlers = []
+        # XXX: there is not yet official short name, so we use "http_upload"
+        host.registerNamespace("http_upload", NS_HTTP_UPLOAD)
 
     def getHandler(self, client):
         return XEP_0363_handler(self)