EAP 7.3.0 Domain fails to start with a LDAP security-realm configured in host.xml

Issue

• The domain fails to start, with the following error/exceptions recorded in the logs:

  2020-04-03 22:28:23,686 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-6) MSC000001: Failed to start service org.wildfly.core.management.security.realm.LDAPRealm: org.jboss.msc.service.StartException in service org.wildfly.core.management.security.realm.LDAPRealm: WFLYDM0042: Multiple CallbackHandlerServices for the same mechanism (PLAIN)
          at org.jboss.as.domain.management.security.SecurityRealmService.start(SecurityRealmService.java:226)
          at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1739)
          at org.jboss.msc.service.ServiceControllerImpl$StartTask.execute(ServiceControllerImpl.java:1701)
          at org.jboss.msc.service.ServiceControllerImpl$ControllerTask.run(ServiceControllerImpl.java:1559)
          at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
          at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1982)
          at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
          at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
          at java.lang.Thread.run(Thread.java:748)