Description of problem:
ClientCompatibilityUnitTestCase freeze with non-"en_US.UTF-8" locale settings. These LANG are affected:

• de_DE.UTF-8
• es_ES.UTF-8
• fr_FR.UTF-8
• ja_JP.UTF-8
• pt_BR.UTF-8
• zh_CN.UTF-8

These test methods are affected:

• testCore100Final
• testCore100FinalHttp
• testCore101Final
• testCore101FinalHttp

Workaround: Add this line to createClient method od ClientCompatibilityUnitTestCase:

classLoaderBuilder.addParentFirstClassPattern("org.jboss.as.protocol.logging.ProtocolLogger");

This could relates with JBEAP-12673 or JBEAP-12818

How reproducible:
Always

Steps to Reproduce:

1. export LANG=de_DE.UTF-8
2. mvn install -B -fae -Dmaven.test.failure.ignore=true -llr -Dts.basic -Djboss.dist=$JBOSS_DIST -Dtest=ClientCompatibilityUnitTestCase -DfailIfNoTests=false -DtestLogToFile=false

Actual results:

Exception in thread "Remoting "management-client" task-5" java.lang.NoClassDefFoundError: Could not initialize class org.jboss.as.protocol.logging.ProtocolLogger
	at org.jboss.as.protocol.mgmt.ManagementChannelReceiver.handleMessage(ManagementChannelReceiver.java:103)
	at org.jboss.remoting3.remote.RemoteConnectionChannel$5.run(RemoteConnectionChannel.java:463)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

Expected results:
No errors