Merge "[gatekeeperd] invalidate stale password cache" into mnc-dev

    bool DoVerify(const password_handle_t *expected_handle, const SizedBuffer &password) {

        FastHashMap::const_iterator it = fast_hash_map_.find(expected_handle->user_id);

        if (it != fast_hash_map_.end()) {

            return VerifyFast(it->second, password);

        if (it != fast_hash_map_.end() && VerifyFast(it->second, password)) {

            return true;

        } else {

            if (GateKeeper::DoVerify(expected_handle, password)) {

                uint64_t salt;