[Bug 2038109] [NEW] Failed to create port on network <UUID>, because fixed_ips included invalid subnet <UUID>

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[Impact]

When creating a new "cluster"that overrides the fixed network defined in
the cluster template, but not the subnet.

It would be expected that the cluster create request fails with a 400
error since the client is submitting an invalid request.

[Environment]

Focal Ussuri

[Test Case]

1. Create a new cluster template WITHOUT a fixed network/subnet set.
openstack coe cluster template create k8s-cluster-template \
    --image fedora-coreos-32 \
    --keypair testkey \
    --external-network ext_net \
    --flavor m1.small \
    --network-driver flannel \
    --coe kubernetes \
    --fixed-network admin_net \
    --fixed-subnet admin_subnet

2. Create a new cluster using the template previously created and select
an existing network

openstack coe cluster create \
    --cluster-template k8s-cluster-template \
    --timeout 120 \
    --fixed-network private \
    k8scluster

Expected result

The cluster gets created

Actual result:

The cluster creation fails with the following error:

$ openstack coe cluster show k8scluster -f json -c faults | jq -r '.faults'
{
  "default-master": "Resource CREATE failed: BadRequest: resources.kube_masters.resources[0].resources.kube_master_eth0: Invalid input for operation: Failed to create port on network 525df7a4-1aeb-4eae-a37f-432a809a8161, because fixed_ips included invalid subnet 30e1b4ed-811f-4226-a19d-0a56cc72fc10.\nNeutron server returns request_ids: ['req-7a55a40a-3aa3-4a67-8ecf-b2e47ae16a84']",
  "default-worker": "Resource CREATE failed: BadRequest: resources.kube_masters.resources[0].resources.kube_master_eth0: Invalid input for operation: Failed to create port on network 525df7a4-1aeb-4eae-a37f-432a809a8161, because fixed_ips included invalid subnet 30e1b4ed-811f-4226-a19d-0a56cc72fc10.\nNeutron server returns request_ids: ['req-7a55a40a-3aa3-4a67-8ecf-b2e47ae16a84']"
}

** Affects: cloud-archive
     Importance: Undecided
         Status: Invalid

** Affects: cloud-archive/antelope
     Importance: Undecided
         Status: In Progress

** Affects: cloud-archive/bobcat
     Importance: Undecided
         Status: In Progress

** Affects: cloud-archive/ussuri
     Importance: Undecided
         Status: New

** Affects: cloud-archive/yoga
     Importance: Undecided
         Status: New

** Affects: cloud-archive/zed
     Importance: Undecided
         Status: In Progress

** Affects: magnum
     Importance: Undecided
     Assignee: Felipe Reyes (freyes)
         Status: Fix Released

** Affects: magnum (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: magnum (Ubuntu Focal)
     Importance: Undecided
         Status: In Progress

** Affects: magnum (Ubuntu Jammy)
     Importance: Undecided
         Status: In Progress


** Tags: patch
-- 
Failed to create port on network <UUID>, because fixed_ips included invalid subnet <UUID>
https://bugs.launchpad.net/bugs/2038109
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