The testsuite/layers pom uses the provisioning.phase.preview.excluded property to disable some provisioning executions when -Dts.ee9 is used. Basically it should disable all that require the wildfly-servlet feature pack (as they are off-topic), all that require the test-feature-pack (as it's not based on wildfly-preview) and all that require layers that have been dropped from WildFly Preview (e.g. legacy security stuff). There are a few cases where this isn't handled correctly; fix them.