* stable-2.15:
ChangeQueryBuilder: Remove unused Config parameter from constructor
Release 2.15-rc3
Schema_159: Don't set closed changes as WIP/private
Change default of migrating draft changes to WIP, not private
Remove handling of change.allowDrafts
Remove documentation on change.allowDrafts
Change-Id: I841e44ca792371d89b5f646df8f69739ec1284be