Kafka broker restart failed due to below error:
raise Fail("Configuration parameter '" + self.name + "' was not found in configurations dictionary!")
resource_management.core.exceptions.Fail: Configuration parameter 'xasecure.audit.destination.db' was not found in configurations dictionary!
During RU downgrade, <pre-upgrade/> runs on downgrade as well, which deleted xasecure.audit.destination.db config property.
<task xsi:type="configure" id="hdp_2_5_0_0_remove_ranger_kafka_audit_db" />
Need to override it with a blank <pre-downgrade/> element.