Remove devstack-tobiko-centos job

The centos job has not worked for a long time, while it was only run in
the periodic pipeline.

Change-Id: I11fc943e77f6f8d14682049f398ba41926723894

Vagrantfile

@@ -12,7 +12,6 @@ MEMORY = ENV.fetch("VM_SIZE", "8192").to_i
 
 # Every Vagrant development environment requires a box. You can search for
 # boxes at https://vagrantcloud.com/search.
-# BOX = ENV.fetch("VM_BOX", "generic/centos8")
 BOX = ENV.fetch("VM_BOX", "generic/ubuntu2204")
 
 # Machine host name

playbooks/devstack/pre.yaml

@@ -12,6 +12,5 @@
 
 - hosts: all
   roles:
-    - {role: devstack-tobiko-centos, when: ansible_distribution == 'CentOS'}
     - role: multi-node-setup
     - role: orchestrate-devstack

roles/devstack-tobiko-vagrant/tasks/main.yaml

@@ -16,18 +16,3 @@
   become: true
   when:
     - ansible_os_family == 'Debian'
-
-- become: true
-  when:
-    - ansible_distribution == "CentOS"
-    - ansible_distribution_major_version == "8"
-  block:
-    - name: Switch from CentOS Linux repos to Centos Stream repos
-      command: dnf -y swap centos-linux-repos centos-stream-repos
-      args:
-        warn: false
-
-    - name: Switch packages from CentOS Linux to to Centos Stream
-      command: dnf -y distro-sync
-      args:
-        warn: false

zuul.d/devstack-tobiko-centos.yaml

@@ -1,20 +0,0 @@
----
-
-- project-template:
-    name: devstack-tobiko-centos
-    description: CentOS Devstack Tobiko Plugin job
-    check: &CHECK
-      jobs:
-        - devstack-tobiko-centos
-    periodic: *CHECK
-
-
-# --- Minimal jobs -----------------------------------------------------------
-
-- job:
-    abstract: false
-    name: devstack-tobiko-centos
-    parent: devstack-tobiko-minimal
-    nodeset: devstack-tobiko-centos
-    voting: false
-    description: CentOS Devstack Tobiko Plugin job

zuul.d/nodesets.yaml

@@ -20,14 +20,6 @@
     groups: *STANDALONE_GROUPS
 
 
-- nodeset:
-    name: devstack-tobiko-centos
-    nodes:
-      - name: controller
-        label: nested-virt-centos-9-stream
-    groups: *STANDALONE_GROUPS
-
-
 # --- MULTINODE --------------------------------------------------------------
 
 - nodeset:

zuul.d/project.yaml

@@ -4,7 +4,6 @@
     templates:
       - ansible-role-jobs
       - devstack-tobiko
-      - devstack-tobiko-centos
       - devstack-tobiko-designate
       - devstack-tobiko-functional
       - devstack-tobiko-heat