public void verifyAuthenticationNoReauthMetric(int successfulAuthenticationNoReauths) throws InterruptedException {
        waitForMetrics("successful-authentication-no-reauth", successfulAuthenticationNoReauths,
                EnumSet.of(MetricType.TOTAL));
    }
Non-blocking EchoServer implementation that uses ChannelBuilder to create channels
with the configured security protocol.
clients/src/test/java/org/apache/kafka/common/network/NioEchoServer.java