testLogging for Cli tests in Wildfly-core testsuite fails on IBM JDK.

reproduce
cd wildfly-core/testsuite
mvn clean test -fae -Dts.manualmode -pl manualmode,standalone -Dtest=CLIEmbedHostControllerTestCase,CLIEmbedServerTestCase,SilentModeTestCase
...
[ERROR] Failures:
[ERROR] SilentModeTestCase.testLogging:99->checkIfEmpty:152
[INFO]
[ERROR] Tests run: 3, Failures: 1, Errors: 0, Skipped: 0
...
[ERROR] Failures:
[ERROR] CLIEmbedHostControllerTestCase.testHelp:321->checkLogging:744
[ERROR] CLIEmbedHostControllerTestCase.testStdOutDefault:160->stdoutTest:188->checkClientSideLogging:231->checkLogging:744
[ERROR] CLIEmbedHostControllerTestCase.testStdOutDiscard:166->stdoutTest:188->checkClientSideLogging:231->checkLogging:744
[ERROR] CLIEmbedHostControllerTestCase.testStdOutEcho:172->stdoutTest:188->checkClientSideLogging:231->checkLogging:744
[ERROR] CLIEmbedServerTestCase.testHelp:543->checkLogging:764
[ERROR] CLIEmbedServerTestCase.testStdOutDefault:196->stdoutTest:224->checkClientSideLogging:267->checkLogging:764
[ERROR] CLIEmbedServerTestCase.testStdOutDiscard:202->stdoutTest:224->checkClientSideLogging:267->checkLogging:764
[ERROR] CLIEmbedServerTestCase.testStdOutEcho:208->stdoutTest:224->checkClientSideLogging:267->checkLogging:764
[INFO]
[ERROR] Tests run: 51, Failures: 8, Errors: 0, Skipped: 0