OpenStack migration from LDAP assignment backend to SQL backend

The migration is tricky and I don’t think OpenStack has any tool for this kind of migration.  Since this is only a one time thing, I just generate the SQL to replace all user_id and project_id in all tables ( nova, glance, cinder, neutron ).  Neutron is still reference the tenant model , so it has the tenant_id column in the database instead of project_id.  After this migration, our OpenStack will be running Liberty with multi-domain support, yah!

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