The legacy package repositories has been removed

[Ayumu Ueha]

Kubernetes community announced the legacy package repositories (apt.kubernetes.io and .) that used in kuryr-kubernetes have been deprecated and they said **their contents, might be removed at any time in the future and without a further notice period.**

[1] https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/change-package-repository/

It looks like the legacy package repositories have been removed some time ago, with the following error in gate of kuryr-kubernetes and other related projects:

```
++ /opt/stack/kuryr-kubernetes/devstack/lib/kubernetes:kubeadm_install:23 : sudo add-apt-repository -y 'deb https://apt.kubernetes.io/ kubernetes-xenial main'
Ign:1 https://mirror-int.iad.rax.opendev.org/ubuntu jammy InRelease
Ign:2 https://mirror-int.iad.rax.opendev.org/ubuntu jammy-updates InRelease
Ign:3 https://mirror-int.iad.rax.opendev.org/ubuntu jammy-backports InRelease
Ign:4 https://mirror-int.iad.rax.opendev.org/ubuntu jammy-security InRelease
Hit:5 https://mirror-int.iad.rax.opendev.org/ubuntu jammy Release
Hit:6 https://mirror-int.iad.rax.opendev.org/ubuntu jammy-updates Release
Hit:7 https://mirror-int.iad.rax.opendev.org/ubuntu jammy-backports Release
Hit:8 https://mirror-int.iad.rax.opendev.org/ubuntu jammy-security Release
Ign:9 https://mirror-int.iad.rax.opendev.org/ubuntu jammy Release.gpg
Ign:10 https://mirror-int.iad.rax.opendev.org/ubuntu jammy-updates Release.gpg
Ign:11 https://mirror-int.iad.rax.opendev.org/ubuntu jammy-backports Release.gpg
Ign:12 https://mirror-int.iad.rax.opendev.org/ubuntu jammy-security Release.gpg
Ign:13 https://packages.cloud.google.com/apt kubernetes-xenial InRelease
Ign:14 https://packages.cloud.google.com/apt kubernetes-xenial Release
Ign:15 https://packages.cloud.google.com/apt kubernetes-xenial/main all Packages
Ign:16 https://packages.cloud.google.com/apt kubernetes-xenial/main amd64 Packages
Ign:15 https://packages.cloud.google.com/apt kubernetes-xenial/main all Packages
Ign:16 https://packages.cloud.google.com/apt kubernetes-xenial/main amd64 Packages
Ign:15 https://packages.cloud.google.com/apt kubernetes-xenial/main all Packages
Ign:16 https://packages.cloud.google.com/apt kubernetes-xenial/main amd64 Packages
Ign:15 https://packages.cloud.google.com/apt kubernetes-xenial/main all Packages
Ign:16 https://packages.cloud.google.com/apt kubernetes-xenial/main amd64 Packages
Ign:15 https://packages.cloud.google.com/apt kubernetes-xenial/main all Packages
Ign:16 https://packages.cloud.google.com/apt kubernetes-xenial/main amd64 Packages
Ign:15 https://packages.cloud.google.com/apt kubernetes-xenial/main all Packages
Ign:16 https://packages.cloud.google.com/apt kubernetes-xenial/main amd64 Packages
Ign:15 https://packages.cloud.google.com/apt kubernetes-xenial/main all Packages
Err:16 https://packages.cloud.google.com/apt kubernetes-xenial/main amd64 Packages
  404 Not Found [IP: 2607:f8b0:4004:c1b::71 443]
Reading package lists...
W: The repository 'https://apt.kubernetes.io kubernetes-xenial Release' does not have a Release file.
E: Failed to fetch https://packages.cloud.google.com/apt/dists/kubernetes-xenial/main/binary-amd64/Packages 404 Not Found [IP: 2607:f8b0:4004:c1b::71 443]
E: Some index files failed to download. They have been ignored, or old ones used instead.
Repository: 'deb https://apt.kubernetes.io/ kubernetes-xenial main'
Description:
Archive for codename: kubernetes-xenial components: main
More info: https://apt.kubernetes.io/
```

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/kuryr-kubernetes/+/910962

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/kuryr-kubernetes/+/910962
Committed: https://opendev.org/openstack/kuryr-kubernetes/commit/0c1fe5fd3c5b441c8d0b8e36997f4293ea891a27
Submitter: "Zuul (22348)"
Branch: master

commit 0c1fe5fd3c5b441c8d0b8e36997f4293ea891a27
Author: Ayumu Ueha <email address hidden>
Date: Mon Mar 4 15:58:11 2024 +0000

    Change k8s package repository

    Closes-Bug: #2055979
    Change-Id: Ib43164901cbc23038eff7c2b110078555d5e4ba3

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/kuryr-kubernetes 10.0.0.0rc1 release candidate.