[WFCORE-6538] Prepare for upcoming JBoss Remoting & XNIO releases whe…

…re peer shut down is propagated to XNIO & Remoting.

testsuite/elytron/src/test/java/org/wildfly/test/integration/elytron/sasl/mgmt/AbstractKerberosMgmtSaslTestBase.java

@@ -19,6 +19,7 @@
 import java.io.IOException;
 import java.net.ConnectException;
 import java.net.MalformedURLException;
+import java.nio.channels.ClosedChannelException;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.security.GeneralSecurityException;
@@ -353,7 +354,7 @@ protected void assertAuthenticationFails(String message, Class<? extends Excepti
                     is(instanceOf(ConnectException.class)));
             assertThat("Unexpected type of inherited exception for authentication failure", cause.getCause(),
                     anyOf(is(instanceOf(SSLException.class)), is(instanceOf(SaslException.class)),
-                            is(instanceOf(RedirectException.class))));
+                            is(instanceOf(RedirectException.class)), is(instanceOf(ClosedChannelException.class))));
         }
     }