HostExcludesTestCase tries to get all the possible available extensions by checking the presence of `META-INF/services/org.jboss.as.controller.Extension` in a certain JBoss Modules module.

So that if a module X contains a resource named `META-INF/services/org.jboss.as.controller.Extension`, then the test case assumes this module is a WildFly Extension.

This behaviour has make "org.wildfly.extension.elytron.jaas-realm" be assumed as a regular WildFly extension, however this module is not an extension, it is just a JBoss Modules module that export `org/wildfly/extension/elytron/JaasCustomSecurityRealmWrapper`