private JID getUserJID() {
        return XMPPServer.getInstance().createJID(getUsername(), null, true);
    }
A shared group of the user has been renamed. Update the existing roster items with the new
name of the shared group and make a roster push for all the available resources.

@param users group users of the renamed group.
xmppserver/src/main/java/org/jivesoftware/openfire/roster/Roster.java