neutron/releasenotes/notes/pluggable-ipam-is-default-1...

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---
prelude: >
The internal pluggable IPAM implementation -- added in the Liberty release
-- is now the default for both old and new deployments. Old deployments
are unconditionally switched to pluggable IPAM during upgrade.
Old non-pluggable IPAM is deprecated and removed from code base.
upgrade:
- During upgrade 'internal' ipam driver becomes default for 'ipam_driver'
config option and data is migrated to new tables using alembic migration.
deprecations:
- The non-pluggable ipam implementatios is deprecated and will be removed in
Newton release cycle.