Fix unmaintained branch CI

Zed is now call `unmaintained/zed` not `stable/zed`
This is requred for unmaintained/zed CI in Cinder.

NOTE(elod.illes): cinderlib is retired, hence the repository is empty
on master branch, causing issues with build-openstack-releasenotes job,
which should run on master. To unblock the gate this job (actually,
release-notes-jobs-python3 job template) needs to be dropped.

NOTE(elod.illes): centos-8-stream nodeset is removed from zuul config,
let's replace it with centos-9-stream in cinderlib-lvm-functional as
that OS is still supported. Also, set it as non-voting in check queue
and remove from gate queue to not block the gate.

Conflicts:
  tox.ini

Change-Id: If769d9da92b724d40f47c9a57a75c021809c8850
(cherry picked from commit 6210535b90a43b4bd6990784e12d112a6dfa289f)

.zuul.yaml

@@ -2,14 +2,14 @@
     queue: integrated
     templates:
       - publish-openstack-docs-pti
-      - release-notes-jobs-python3
     check:
       jobs:
         - openstack-tox-pep8
         - cinderlib-tox-py36
         - cinderlib-tox-py39
 
-        - cinderlib-lvm-functional
+        - cinderlib-lvm-functional:
+            voting: false
         - cinderlib-ceph-functional
         - cinderlib-os-brick-src-tempest-lvm-lio-barbican-yoga
     gate:
@@ -18,7 +18,6 @@
         - cinderlib-tox-py36
         - cinderlib-tox-py39
 
-        - cinderlib-lvm-functional
         - cinderlib-ceph-functional
         - cinderlib-os-brick-src-tempest-lvm-lio-barbican-yoga
     post:
@@ -67,7 +66,7 @@
     name: cinderlib-lvm-functional
     parent: cinderlib-functional
     pre-run: playbooks/setup-lvm.yaml
-    nodeset: centos-8-stream
+    nodeset: centos-9-stream
     vars:
       tox_environment:
         # Workaround for https://github.com/pypa/pip/issues/6264

tox.ini

@@ -31,8 +31,8 @@ usedevelop=True
 # NOTE: Functional tests may fail if host is missing bindeps from deps projects
 deps =
     -r{toxinidir}/test-requirements.txt
-    git+https://opendev.org/openstack/os-brick@stable/yoga#egg=os-brick
-    git+https://opendev.org/openstack/cinder@stable/yoga#egg=cinder
+    git+https://opendev.org/openstack/os-brick@unmaintained/yoga#egg=os-brick
+    git+https://opendev.org/openstack/cinder@unmaintained/yoga#egg=cinder
 
 commands =
     find . -ignore_readdir_race -type f -name "*.pyc" -delete