feat(visitors): Broadcast conference props to vnodes.

Author: damencho

jicofo/src/main/java/org/jitsi/jicofo/conference/JitsiMeetConferenceImpl.java

@@ -602,7 +602,13 @@ private void setConferenceProperty(@NotNull String key, @NotNull String value, b
         ChatRoom chatRoom = this.chatRoom;
         if (updatePresence && chatRoom != null && !value.equals(oldValue))
         {
-            chatRoom.setPresenceExtension(createConferenceProperties());
+            ConferenceProperties newProps = createConferenceProperties();
+            chatRoom.setPresenceExtension(newProps);
+
+            for (final ChatRoom visitorChatRoom: visitorChatRooms.values())
+            {
+                visitorChatRoom.setPresenceExtension(newProps);
+            }
         }
     }