* tokenGroups constructed attribute retrieved via LDAP).
     * <p/>
     * Domain groups nested inside a local group are currently not expanded. In
     * this case the key (SID) type will be SID_TYPE_DOM_GRP rather than
     * SID_TYPE_USER.
     * 
     * @param tc
     *            The context to use
     * @param authorityServerName
     *            The server from which the local groups will be queried.