default Optional<NetworkReceive> pollResponseReceivedDuringReauthentication() {
        return Optional.empty();
    }
Return the next (always non-null but possibly empty) client-side
{@link NetworkReceive} response that arrived during re-authentication that
is unrelated to re-authentication, if any. These correspond to requests sent
prior to the beginning of re-authentication; the requests were made when the
channel was successfully authenticated, and the responses arrived during the
re-authentication process. The response returned is removed from the authenticator's
queue. Responses of requests sent after completion of re-authentication are
processed only when the authenticator response queue is empty.

@return the (always non-null but possibly empty) client-side
        {@link NetworkReceive} response that arrived during
        re-authentication that is unrelated to re-authentication, if any
clients/src/main/java/org/apache/kafka/common/network/Authenticator.java