fix(neutron): handle centralized and distributed router ports properly - #2171
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link_vxlan_network_ha_chassis_group anchored the internal router-interface Logical_Router_Port to the network's unified HA_Chassis_Group. Every vxlan gateway router is centralized (options:chassis set), and anchoring one of its ports as a distributed gateway port makes ovn-northd log "Bad configuration: distributed gateway port configured on port ... on L3 gateway router" and ignore the setting anyway. Skip that anchor whenever the owning router is centralized; the network HCG population (the part that actually fixes external/baremetal port routing) is untouched. Also fix scripts/cleanup_dead_ovn_ha_chassis.py to match: - Drop the now-invalid LRP anchor from Phase 2's repopulation action. - Phase 2 previously derived the gateway chassis solely from the router's own per-router HA_Chassis_Group (neutron-<router_id>). That group is only ever created once, at gateway-port-creation time, and nothing recreates it if deleted -- several routers in the fleet had options:chassis set but no such group, so Phase 2 skipped them forever. Now reads Logical_Router.options.chassis directly as the primary, always-reliable source, falling back to the per-router HCG only when the router isn't centralized.
cardoe
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We need the fix in https://review.opendev.org/c/openstack/neutron/+/998088 to ensure that our router ports get properly scheduled and not incorrectly pinned which breaks their traffic. Plus this backports https://review.opendev.org/c/openstack/neutron/+/999158 which at this time is proposed upstream.
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Rebased our understack/2026.1 on top of the latest stable/2026.1 so that we pull in https://review.opendev.org/c/openstack/neutron/+/998088 which is needed to ensure Neutron does not incorrectly pin ports. At the same time update our HCG workaround to avoid setting it on ports that are centralized.