Merge "[CI] Drop CentOS Linux 8 job and nodeset" into stable/wallaby

.zuul.yaml

@@ -48,16 +48,6 @@
         nodes:
           - controller
 
-- nodeset:
-    name: devstack-single-node-centos-8
-    nodes:
-      - name: controller
-        label: centos-8
-    groups:
-      - name: tempest
-        nodes:
-          - controller
-
 - nodeset:
     name: devstack-single-node-centos-8-stream
     nodes:
@@ -576,14 +566,6 @@
 # we often have to rush things through devstack to stabilise the gate,
 # and these platforms don't have the round-the-clock support to avoid
 # becoming blockers in that situation.
-- job:
-    name: devstack-platform-centos-8
-    parent: tempest-full-py3
-    description: Centos 8 platform test
-    nodeset: devstack-single-node-centos-8
-    voting: false
-    timeout: 9000
-
 - job:
     name: devstack-platform-bionic
     parent: tempest-full-py3
@@ -684,7 +666,6 @@
       jobs:
         - devstack
         - devstack-ipv6
-        - devstack-platform-centos-8
         - devstack-platform-bionic
         - devstack-platform-centos-8-stream
         - devstack-async