Clean up centos-7 based jobs

There is no Centos-7 nodeset anymore, so let's get rid of those jobs,
or use centos-8-stream if possible. Also remove old rolling upgrade
jobs that would run against branches that are already End of Life.
Grenade job is currently broken, let's remove it from gate and set it
non-voting on check queue to unblock gate. Grenade is part of the
integrated-gate-object-storage template [1], so that has to be removed
and its jobs have to be added explicitly (definition of job
tempest-integrated-object-storage is already re-defined (overriden),
but openstacksdk-functional-devstack has to be added).

[1] 1c3fc43c9d/zuul.d/integrated-gate.yaml

Change-Id: Id56057262fc37add3a47c50946067f8c873c7515

.zuul.yaml

@@ -27,11 +27,6 @@
         NOSE_COVER_HTML_DIR: '{toxinidir}/cover'
     post-run: tools/playbooks/common/cover-post.yaml
 
-- job:
-    name: swift-tox-py27-centos-7
-    parent: swift-tox-py27
-    nodeset: centos-7
-
 - job:
     name: swift-tox-py36
     parent: swift-tox-base
@@ -223,11 +218,6 @@
     vars:
       tox_envlist: func-ec-py3
 
-- job:
-    name: swift-tox-func-py27-centos-7
-    parent: swift-tox-func-py27
-    nodeset: centos-7
-
 - job:
     name: swift-tox-func-encryption-py27
     parent: swift-tox-base
@@ -240,11 +230,6 @@
     vars:
       tox_envlist: func-encryption
 
-- job:
-    name: swift-tox-func-encryption-py27-centos-7
-    parent: swift-tox-func-encryption-py27
-    nodeset: centos-7
-
 - job:
     name: swift-tox-func-ec-py27
     parent: swift-tox-base
@@ -257,11 +242,6 @@
     vars:
       tox_envlist: func-ec
 
-- job:
-    name: swift-tox-func-ec-py27-centos-7
-    parent: swift-tox-func-ec-py27
-    nodeset: centos-7
-
 - job:
     name: swift-dsvm-functional
     parent: devstack-minimal
@@ -343,22 +323,6 @@
     post-run:
       - tools/playbooks/probetests/post.yaml
 
-- job:
-    name: swift-probetests-centos-7
-    parent: swift-probetests-centos-8-stream
-    nodeset: centos-7
-    description: |
-      Setup a SAIO dev environment and run Swift's probe tests
-      under Python 2.
-    vars:
-      bindep_profile: test py27
-      ensure_pip_from_packages: False
-      ensure_pip_from_packages_with_python2: False
-      ensure_pip_from_upstream: True
-      ensure_pip_from_upstream_interpreters:
-        - python2
-      ensure_pip_from_upstream_url: "https://bootstrap.pypa.io/pip/2.7/get-pip.py"
-
 - job:
     name: swift-probetests-centos-8-stream
     parent: unittests
@@ -461,35 +425,23 @@
     run: tools/playbooks/multinode_setup/run.yaml
     post-run: tools/playbooks/probetests/post.yaml
 
-- job:
-    name: swift-multinode-rolling-upgrade-train
-    parent: swift-multinode-rolling-upgrade
-    vars:
-      previous_swift_version: origin/stable/train
-
-- job:
-    name: swift-multinode-rolling-upgrade-ussuri
-    parent: swift-multinode-rolling-upgrade
-    vars:
-      previous_swift_version: origin/stable/ussuri
-
 - job:
     name: swift-multinode-rolling-upgrade-victoria
     parent: swift-multinode-rolling-upgrade
     vars:
-      previous_swift_version: origin/stable/victoria
+      previous_swift_version: origin/unmaintained/victoria
 
 - job:
     name: swift-multinode-rolling-upgrade-wallaby
     parent: swift-multinode-rolling-upgrade
     vars:
-      previous_swift_version: origin/stable/wallaby
+      previous_swift_version: origin/unmaintained/wallaby
 
 - job:
     name: swift-multinode-rolling-upgrade-xena
     parent: swift-multinode-rolling-upgrade
     vars:
-      previous_swift_version: origin/stable/xena
+      previous_swift_version: origin/unmaintained/xena
 
 - job:
     name: swift-multinode-rolling-upgrade-master
@@ -643,7 +595,6 @@
       - periodic-stable-jobs
       - check-requirements
       - release-notes-jobs-python3
-      - integrated-gate-object-storage
       - swift-jobs-arm64
     check:
       jobs:
@@ -712,15 +663,13 @@
               - ^doc/(requirements.txt|(manpages|s3api|source)/.*)$
               - ^test/(cors|unit|functional|probe)/.*$
               - ^(.gitreview|.mailmap|AUTHORS|CHANGELOG|.*\.rst)$
-        - swift-probetests-centos-7:
+        - swift-probetests-centos-8-stream:
             irrelevant-files: &probetest-irrelevant-files
               - ^(api-ref|releasenotes)/.*$
               # Keep doc/saio -- we use those sample configs in the saio playbooks
               - ^doc/(requirements.txt|(manpages|s3api|source)/.*)$
               - ^test/(cors|unit|functional|s3api)/.*$
               - ^(.gitreview|.mailmap|AUTHORS|CHANGELOG|.*\.rst)$
-        - swift-probetests-centos-8-stream:
-            irrelevant-files: *probetest-irrelevant-files
         - swift-dsvm-functional:
             irrelevant-files: *functest-irrelevant-files
         - swift-dsvm-functional-ipv6:
@@ -744,6 +693,8 @@
             irrelevant-files: *tempest-irrelevant-files
         - grenade:
             irrelevant-files: *tempest-irrelevant-files
+            voting: false
+        - openstacksdk-functional-devstack
     gate:
       jobs:
         # For gate jobs, err towards running more jobs (so, generally avoid
@@ -765,8 +716,6 @@
         - swift-tox-func-ec-py38
         - swift-func-cors
         - swift-tox-func-s3api-tests-tempauth
-        - swift-probetests-centos-7:
-            irrelevant-files: *probetest-irrelevant-files
         - swift-probetests-centos-8-stream:
             irrelevant-files: *probetest-irrelevant-files
         - swift-dsvm-functional:
@@ -779,26 +728,17 @@
             irrelevant-files: *pep8-irrelevant-files
         - tempest-integrated-object-storage:
             irrelevant-files: *tempest-irrelevant-files
+        - openstacksdk-functional-devstack
         - tempest-ipv6-only:
             irrelevant-files: *tempest-irrelevant-files
-        - grenade:
-            irrelevant-files: *tempest-irrelevant-files
     experimental:
       jobs:
         - swift-tox-py37
         - swift-tox-py38
-        - swift-tox-py27-centos-7
-        - swift-tox-func-py27-centos-7
-        - swift-tox-func-encryption-py27-centos-7
-        - swift-tox-func-ec-py27-centos-7
         - swift-tox-py36-centos-8-stream
         - swift-tox-func-py39-centos-9-stream
         - swift-tox-func-encryption-py39-centos-9-stream
         - swift-tox-func-ec-py39-centos-9-stream
-        - swift-multinode-rolling-upgrade-rocky
-        - swift-multinode-rolling-upgrade-stein
-        - swift-multinode-rolling-upgrade-train
-        - swift-multinode-rolling-upgrade-ussuri
         - swift-multinode-rolling-upgrade-victoria
         - swift-multinode-rolling-upgrade-wallaby
         - swift-multinode-rolling-upgrade-xena