[CI] Stop testing non-stream CentOS

Per [1].
It was agreed on during a Kolla IRC meeting. [2]

[1] http://lists.openstack.org/pipermail/openstack-discuss/2021-December/026408.html
[2] https://meetings.opendev.org/meetings/kolla/2021/kolla.2021-12-22-15.01.log.html#l-53

Depends-On: https://review.opendev.org/c/openstack/kayobe-config-dev/+/823268
Change-Id: Iff8c9c5d3b13207c25ae58fee4053426b13d62fb

zuul.d/jobs.yaml

@@ -98,11 +98,6 @@
     run: playbooks/kayobe-overcloud-base/run.yml
     timeout: 7200
 
-- job:
-    name: kayobe-overcloud-centos8
-    parent: kayobe-overcloud-base
-    nodeset: kayobe-centos8
-
 - job:
     name: kayobe-overcloud-centos8s
     parent: kayobe-overcloud-base
@@ -114,11 +109,6 @@
     vars:
       tls_enabled: true
 
-- job:
-    name: kayobe-overcloud-tls-centos8
-    parent: kayobe-overcloud-tls-base
-    nodeset: kayobe-centos8
-
 - job:
     name: kayobe-overcloud-tls-centos8s
     parent: kayobe-overcloud-tls-base
@@ -139,11 +129,6 @@
     # previous release which takes a considerable amount of time.
     attempts: 3
 
-- job:
-    name: kayobe-overcloud-upgrade-centos8
-    parent: kayobe-overcloud-upgrade-base
-    nodeset: kayobe-centos8
-
 - job:
     name: kayobe-overcloud-upgrade-centos8s
     parent: kayobe-overcloud-upgrade-base
@@ -160,11 +145,6 @@
     run: playbooks/kayobe-seed-base/run.yml
     timeout: 5400
 
-- job:
-    name: kayobe-seed-centos8
-    parent: kayobe-seed-base
-    nodeset: kayobe-centos8
-
 - job:
     name: kayobe-seed-centos8s
     parent: kayobe-seed-base
@@ -183,11 +163,6 @@
     run: playbooks/kayobe-overcloud-host-configure-base/run.yml
     timeout: 7200
 
-- job:
-    name: kayobe-overcloud-host-configure-centos8
-    parent: kayobe-overcloud-host-configure-base
-    nodeset: kayobe-centos8
-
 - job:
     name: kayobe-overcloud-host-configure-centos8s
     parent: kayobe-overcloud-host-configure-base
@@ -208,11 +183,6 @@
     # previous release which takes a considerable amount of time.
     attempts: 3
 
-- job:
-    name: kayobe-seed-upgrade-centos8
-    parent: kayobe-seed-upgrade-base
-    nodeset: kayobe-centos8
-
 - job:
     name: kayobe-seed-upgrade-centos8s
     parent: kayobe-seed-upgrade-base
@@ -230,11 +200,6 @@
     run: playbooks/kayobe-seed-vm-base/run.yml
     timeout: 5400
 
-- job:
-    name: kayobe-seed-vm-centos8
-    parent: kayobe-seed-vm-base
-    nodeset: kayobe-centos8
-
 - job:
     name: kayobe-seed-vm-centos8s
     parent: kayobe-seed-vm-base

zuul.d/nodesets.yaml

@@ -1,10 +1,4 @@
 ---
-- nodeset:
-    name: kayobe-centos8
-    nodes:
-      - name: primary
-        label: centos-8
-
 - nodeset:
     name: kayobe-centos8s
     nodes:

zuul.d/project.yaml

@@ -10,37 +10,23 @@
         - kayobe-tox-ansible-syntax
         - kayobe-tox-ansible
         - kayobe-tox-molecule
-        - kayobe-overcloud-centos8
         - kayobe-overcloud-centos8s
-        - kayobe-overcloud-tls-centos8
         - kayobe-overcloud-tls-centos8s
-        - kayobe-overcloud-host-configure-centos8
         - kayobe-overcloud-host-configure-centos8s
-        - kayobe-overcloud-upgrade-centos8
         - kayobe-overcloud-upgrade-centos8s
-        - kayobe-seed-centos8
         - kayobe-seed-centos8s
-        - kayobe-seed-upgrade-centos8
         - kayobe-seed-upgrade-centos8s
-        - kayobe-seed-vm-centos8
         - kayobe-seed-vm-centos8s
     gate:
       queue: kayobe
       jobs:
         - kayobe-tox-ansible-syntax
         - kayobe-tox-ansible
         - kayobe-tox-molecule
-        - kayobe-overcloud-centos8
         - kayobe-overcloud-centos8s
-        - kayobe-overcloud-tls-centos8
         - kayobe-overcloud-tls-centos8s
-        - kayobe-overcloud-host-configure-centos8
         - kayobe-overcloud-host-configure-centos8s
-        - kayobe-overcloud-upgrade-centos8
         - kayobe-overcloud-upgrade-centos8s
-        - kayobe-seed-centos8
         - kayobe-seed-centos8s
-        - kayobe-seed-upgrade-centos8
         - kayobe-seed-upgrade-centos8s
-        - kayobe-seed-vm-centos8
         - kayobe-seed-vm-centos8s