During the upgrade process, the Neutron DB was unclear with duplicated value.
The upgrade failed with the following error
1df244e556f5_add_unique_ha_router_agent_port_bindings_py.DuplicateL3HARouterAgentPortBinding: Duplicate L3HARouterAgentPortBinding is created for router(s) d762bf50-8390-47b7-8e4f-4c2aef233b6f. Database cannot be upgraded. Please, remove all duplicates before upgrading th e database.
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