nova/releasenotes/notes/rm_db2-926e38cbda44a55f.yaml

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---
upgrade:
- DB2 database support was removed from tree. This is a non open
source database that had no 3rd party CI, and a set of constraints
that meant we had to keep special casing it in code. It also made
the online data migrations needed for cells v2 and placement
engine much more difficult. With 0% of OpenStack survey users
reporting usage we decided it was time to remove this to focus on
features needed by the larger community.