Drop centos 8 stream testing

In Zed cycle testing runtime, we are targetting the centos 9 stream
- https://governance.openstack.org/tc/reference/runtimes/zed.html

With dropping the python 3.6 support, project started adding python 3.8
as minimum, example nova:
- 56b5aed08c/setup.cfg (L13)

with that, centos 8 stream job is failing 100%
- https://zuul.openstack.org/build/970d029dc96742c3aa0f6932a35e97cf
- https://zuul.openstack.org/builds?job_name=devstack-platform-centos-8-stream&job_name=tempest-full-py3-centos-8-stream&skip=0

This commit drops centos-8-stream testing and move their job definition
to stable/jobs.yaml file as they are being used on stable branch testing.

Change-Id: Ie72eaaf30ee15710f9fec266e93a6c8ad4eb5ddc

zuul.d/integrated-gate.yaml

@@ -86,6 +86,17 @@
         # Enbale horizon so that we can run horizon test.
         horizon: true
 
+- job:
+    name: tempest-full-centos-9-stream
+    parent: tempest-full-py3
+    nodeset: devstack-single-node-centos-9-stream
+    description: |
+      Base integration test on CentOS 9 stream
+    vars:
+      # Required until bug/1949606 is resolved when using libvirt and QEMU
+      # >=5.0.0 with a [libvirt]virt_type of qemu (TCG).
+      configure_swap_size: 4096
+
 - job:
     name: tempest-integrated-networking
     parent: devstack-tempest
@@ -129,17 +140,15 @@
         c-bak: false
 
 - job:
-    name: tempest-integrated-compute-centos-8-stream
+    name: tempest-integrated-compute-centos-9-stream
     parent: tempest-integrated-compute
-    # TODO(gmann): Make this job non voting until bug#1957941 if fixed.
-    voting: false
-    nodeset: devstack-single-node-centos-8-stream
+    nodeset: devstack-single-node-centos-9-stream
     branches: ^(?!stable/(ocata|pike|queens|rocky|stein|train|ussuri|victoria)).*$
     description: |
       This job runs integration tests for compute. This is
       subset of 'tempest-full-py3' job and run Nova, Neutron, Cinder (except backup tests)
       and Glance related tests. This is meant to be run on Nova gate only.
-      This version of the job also uses CentOS 8 stream.
+      This version of the job also uses CentOS 9 stream.
     vars:
       # Required until bug/1949606 is resolved when using libvirt and QEMU
       # >=5.0.0 with a [libvirt]virt_type of qemu (TCG).
@@ -357,12 +366,12 @@
         - grenade-skip-level:
             voting: false
         - tempest-integrated-compute
-        - tempest-integrated-compute-centos-8-stream
+        - tempest-integrated-compute-centos-9-stream
         - openstacksdk-functional-devstack
     gate:
       jobs:
         - tempest-integrated-compute
-        - tempest-integrated-compute-centos-8-stream
+        - tempest-integrated-compute-centos-9-stream
         - openstacksdk-functional-devstack
 
 - project-template:

zuul.d/project.yaml

@@ -120,8 +120,6 @@
             irrelevant-files: *tempest-irrelevant-files
         - openstack-tox-bashate:
             irrelevant-files: *tempest-irrelevant-files-2
-        - tempest-full-py3-centos-8-stream:
-            irrelevant-files: *tempest-irrelevant-files
         - tempest-full-centos-9-stream:
             irrelevant-files: *tempest-irrelevant-files
     gate:
@@ -137,8 +135,6 @@
             irrelevant-files: *tempest-irrelevant-files
         - tempest-full-py3:
             irrelevant-files: *tempest-irrelevant-files
-        - tempest-full-py3-centos-8-stream:
-            irrelevant-files: *tempest-irrelevant-files
         - grenade:
             irrelevant-files: *tempest-irrelevant-files
         - tempest-ipv6-only:

zuul.d/stable-jobs.yaml

@@ -198,3 +198,41 @@
       - stable/victoria
       - stable/wallaby
       - stable/xena
+
+- job:
+    name: tempest-integrated-compute-centos-8-stream
+    parent: tempest-integrated-compute
+    # TODO(gmann): Make this job non voting until bug#1957941 if fixed.
+    voting: false
+    nodeset: devstack-single-node-centos-8-stream
+    branches:
+      - stable/wallaby
+      - stable/xena
+      - stable/yoga
+    description: |
+      This job runs integration tests for compute. This is
+      subset of 'tempest-full-py3' job and run Nova, Neutron, Cinder (except backup tests)
+      and Glance related tests. This is meant to be run on Nova gate only.
+      This version of the job also uses CentOS 8 stream.
+    vars:
+      # Required until bug/1949606 is resolved when using libvirt and QEMU
+      # >=5.0.0 with a [libvirt]virt_type of qemu (TCG).
+      configure_swap_size: 4096
+
+- job:
+    name: tempest-full-py3-centos-8-stream
+    parent: tempest-full-py3
+    # TODO(gmann): Make this job non voting until bug#1957941 if fixed.
+    voting: false
+    branches:
+      - stable/wallaby
+      - stable/xena
+      - stable/yoga
+    nodeset: devstack-single-node-centos-8-stream
+    description: |
+      Base integration test with Neutron networking and py36 running
+      on CentOS 8 stream
+    vars:
+      # Required until bug/1949606 is resolved when using libvirt and QEMU
+      # >=5.0.0 with a [libvirt]virt_type of qemu (TCG).
+      configure_swap_size: 4096

zuul.d/tempest-specific.yaml

@@ -68,26 +68,6 @@
         # without Swift, c-bak cannot run (in the Gate at least)
         c-bak: false
 
-- job:
-    name: tempest-full-py3-centos-8-stream
-    parent: tempest-full-py3
-    # TODO(gmann): Make this job non voting until bug#1957941 if fixed.
-    voting: false
-    nodeset: devstack-single-node-centos-8-stream
-    description: |
-      Base integration test with Neutron networking and py36 running
-      on CentOS 8 stream
-    vars:
-      # Required until bug/1949606 is resolved when using libvirt and QEMU
-      # >=5.0.0 with a [libvirt]virt_type of qemu (TCG).
-      configure_swap_size: 4096
-
-- job:
-    name: tempest-full-centos-9-stream
-    parent: tempest-full-py3-centos-8-stream
-    voting: true
-    nodeset: devstack-single-node-centos-9-stream
-
 - job:
     name: tempest-tox-plugin-sanity-check
     parent: tox