component file sharing: changed pubsub identity:

pubsub service disco identity has been changed to non standard "virtual" type, to avoid it to be used as main pubsub service by the client.

src/plugins/plugin_comp_file_sharing.py

@@ -246,6 +246,9 @@ class Comments_handler(pubsub.PubSubService):
         super(Comments_handler, self).__init__() # PubsubVirtualResource())
         self.host = plugin_parent.host
         self.plugin_parent = plugin_parent
+        self.discoIdentity = {'category': 'pubsub',
+                              'type': 'virtual',  # FIXME: non standard, here to avoid this service being considered as main pubsub one
+                              'name': 'files commenting service'}
 
     def _getFileId(self, nodeIdentifier):
         if not nodeIdentifier.startswith(COMMENT_NODE_PREFIX):