private IQ declineActiveList(IQ packet, JID from) {
        // Get the user session
        ClientSession session = sessionManager.getSession(from);
        // Set that there is no active list for this session
        session.setActiveList(null);
        // Return acknowledge of success
        return IQ.createResultIQ(packet);
    }
User has requested that no active list should be used for the current session. Return
acknowledge of success.

@param packet IQ packet declining active list for the current session.
@param from sender of the IQ packet.
@return acknowledge of success.
xmppserver/src/main/java/org/jivesoftware/openfire/handler/IQPrivacyHandler.java