deb-glance/releasenotes/notes/remove-db-downgrade-0d1cc45...

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---
prelude: >
Database downgrades have been removed from the Glance source tree. Please
see ``upgrade`` section for more details.
upgrade:
- The ``db_downgrade`` command has been removed from the
``glance-manage`` utility and all database downgrade
scripts have been removed. In accord with OpenStack
policy, Glance cannot be downgraded any more. Operators
are advised to make a full database backup of their
production data before attempting any upgrade.