AuditService is not available for apps

Issue Summary

While the AuditService class file is available for apps to reference, the actual service is not OSGi-exported and cannot be used. Any app which attempts to use AuditService will fail to start.

Steps to Reproduce

1. Add a <component-import/> or @ComponentImport for AuditService

Expected Results

The app successfully imports the AuditService.

Actual Results

The app fails to start with an error like the following:

[INFO] 2019-01-01 11:11:11,111 ERROR [spring-startup]  c.a.plugin.osgi.factory.OsgiPlugin Plugin 'com.example.myplugin' never resolved service '&auditService' with filter '(objectClass=com.atlassian.bitbucket.audit.AuditService)'

Workaround

There is no workaround for this issue. It will require a software fix in Bitbucket Server, and any app that requires the AuditService will only be able to work when deployed to a fixed version.