Ban log4j:log4j

WildFly doesn't actually ship log4j:log4j, we provide the org.jboss.logmanager:log4j-jboss-logmanager fork.

We should ban it from our dependency tree so it doesn't accidentally sneak in as a transitive dep of something. Some testsuite modules declare it as a dep for use in the test driver; those can use org.jboss.logmanager:log4j-jboss-logmanager as well.