feat(openstack-sync): add NeutronSegmentRange CRD and sync plugin

[geetikabatra]

Add a NeutronSegmentRange CRD to the openstack-sync-operator and a segment_ranges hook plus plugin package that reconciles Neutron network segment ranges (openstack network segment range) from custom resources.

• CRD: neutron.understack.rackspace.net/v1alpha1 NeutronSegmentRange
• plugin: reconcile/create/adopt by owner-prefixed name, prune on removal
• immutable network_type/physical_network mismatches fail loudly
• wired into operator values.yaml (plugins.neutronSegmentRanges, disabled)

What does this change do?

Upgrade impact

• This change requires operator action to upgrade. If checked, add the
  upgrade-impact label and a release note: run scriv create from the
  repository root and describe the required action in the generated
  changelog.d/ file. See RELEASING.md.

Operator action means anything a deployment has to do beyond a normal resync:
deploy repo or values changes, new or removed secrets, enabling or disabling a
component, or a manual one-time step.

Following network ranges were identified from all the branches.

rax-prod-iad3-rxdb-braze-zone1 (18)

1. vxlan 1800000-1849999 shared spine501-13.iad3
2. vlan 4010-4010 physical-network=enrol enrol
3. vlan 1800-3799 shared physical-network=g16-17/g16-18-network g16-17/g16-18-network
4. vlan 1800-3799 shared physical-network=g16-11/g16-12-network g16-11/g16-12-network
5. vlan 1800-3799 shared physical-network=g16-13/g16-14-network g16-13/g16-14-network
6. vlan 1800-3799 shared physical-network=g10-35/g10-36-network g10-35/g10-36-network
7. vlan 1800-3799 shared physical-network=g10-37/g10-38-network g10-37/g10-38-network
8. vlan 1800-3799 shared physical-network=g15-27/g15-28-network g15-27/g15-28-network
9. vlan 1800-3799 shared physical-network=g17-41/g17-42-network g17-41/g17-42-network
10. vlan 1800-3799 shared physical-network=g4-15/g4-16-network g4-15/g4-16-network
11. vlan 1800-3799 shared physical-network=g4-21/g4-22-network g4-21/g4-22-network
12. vlan 1800-3799 shared physical-network=g4-7/g4-8-network g4-7/g4-8-network
13. vlan 1800-3799 shared physical-network=g16-41/g16-42-network g16-41/g16-42-network
14. vlan 1800-3799 shared physical-network=g16-7/g16-8-network g16-7/g16-8-network
15. vlan 1800-3799 shared physical-network=g17-33/g17-34-network g17-33/g17-34-network
16. vlan 1800-3799 shared physical-network=g19-39/g19-40-network g19-39/g19-40-network
17. vlan 1800-3799 shared physical-network=g19-41/g19-42-network g19-41/g19-42-network
18. vlan 1800-3799 shared physical-network=g19-43/g19-44-network g19-43/g19-44-network

rax-prod-ord1-advent (8)

1. vxlan 1900000-1949999 shared spine1201-4.ord1
2. vlan 4010-4010 physical-network=enrol enrol
3. vlan 1800-3799 shared physical-network=j2-13/j2-14-network j2-13/j2-14-network
4. vlan 1800-3799 shared physical-network=j2-15/j2-16-network j2-15/j2-16-network
5. vlan 1800-3799 shared physical-network=j2-21/j2-22-network j2-21/j2-22-network
6. vlan 1800-3799 shared physical-network=j2-29-2/j2-30-2-network j2-29-2/j2-30-2-network
7. vlan 1800-3799 shared physical-network=j2-29/j2-30-network j2-29/j2-30-network
8. vlan 1800-3799 shared physical-network=j2-3/j2-4-network j2-3/j2-4-network

rax-prod-iad3-advent (10)

1. vxlan 2000000-2049999 shared spine404-10.iad3
2. vlan 4010-4010 physical-network=enrol enrol
3. vlan 1800-3799 shared physical-network=f8-7/f8-8-network f8-7/f8-8-network
4. vlan 1800-3799 shared physical-network=f8-13/f8-14-network f8-13/f8-14-network
5. vlan 1800-3799 shared physical-network=f8-17/f8-18-network f8-17/f8-18-network
6. vlan 1800-3799 shared physical-network=f8-25/f8-26-network f8-25/f8-26-network
7. vlan 1800-3799 shared physical-network=f8-41/f8-42-network f8-41/f8-42-network
8. vlan 1800-3799 shared physical-network=f8-41-2/f8-42-2-network f8-41-2/f8-42-2-network
9. vlan 1800-3799 shared physical-network=f8-15/f8-16-network f8-15/f8-16-network
10. vlan 1800-3799 shared physical-network=f10-14/f10-15-network f10-14/f10-15-network

[cardoe]

Dockerfile doesn't COPY segment_ranges.py into /hooks/ — this hook won't exist in the built image. Needs a COPY line like the ones for router_flavors.py/placeholder.py.

Also network_type: flat isn't valid — Neutron's segment range API only supports vlan/vxlan/gre/geneve. Drop it from the CRD enum and PHYSICAL_NETWORK_TYPES.