Fix test jobs

- voluptuous dropped support for py27. see also [0]
- drop centos-8 jobs for which we no longer have images

[0] https://review.opendev.org/c/opendev/glean/+/836194

Change-Id: I6626a5a59625640d1c0b4e9026743441059177e0

test-requirements.txt

@@ -44,3 +44,6 @@ azure-storage-blob
 
 # unittest.mock compatibility package for Python < 3.3
 mock;python_version<'3.3'
+
+# voluptuous dropped support for py27
+voluptuous<0.13.0;python_version=='2.7'

zuul-tests.d/container-roles-jobs.yaml

@@ -17,15 +17,6 @@
         - name: centos-7
           label: centos-7
 
-- job:
-    name: zuul-jobs-test-ensure-docker-centos-8
-    description: Tests ensure-docker role on centos-8
-    parent: zuul-jobs-test-ensure-docker
-    nodeset:
-      nodes:
-        - name: centos-8
-          label: centos-8
-
 - job:
     name: zuul-jobs-test-ensure-docker-centos-8-stream
     description: Tests ensure-docker role on centos-8-stream
@@ -423,15 +414,6 @@
         - name: debian-bullseye
           label: debian-bullseye
 
-- job:
-    name: zuul-jobs-test-ensure-skopeo-centos-8
-    description: Tests ensure-skopeo role on centos-8
-    parent: zuul-jobs-test-ensure-skopeo
-    nodeset:
-      nodes:
-        - name: centos-8
-          label: centos-8
-
 - job:
     name: zuul-jobs-test-ensure-skopeo-fedora-35
     description: Tests ensure-skopeo role on fedora-35
@@ -468,7 +450,6 @@
     check:
       jobs:
         - zuul-jobs-test-ensure-docker-centos-7
-        - zuul-jobs-test-ensure-docker-centos-8
         - zuul-jobs-test-ensure-docker-centos-8-stream
         - zuul-jobs-test-ensure-docker-ubuntu-bionic
         - zuul-jobs-test-build-container-image-release
@@ -488,14 +469,12 @@
         - zuul-jobs-test-ensure-podman-ubuntu-bionic
         - zuul-jobs-test-ensure-podman-ubuntu-focal
         - zuul-jobs-test-ensure-podman-debian-bullseye
-        - zuul-jobs-test-ensure-skopeo-centos-8
         - zuul-jobs-test-ensure-skopeo-fedora-35
         - zuul-jobs-test-ensure-skopeo-ubuntu-bionic
         - zuul-jobs-test-ensure-skopeo-ubuntu-focal
     gate:
       jobs: &id001
         - zuul-jobs-test-ensure-docker-centos-7
-        - zuul-jobs-test-ensure-docker-centos-8
         - zuul-jobs-test-ensure-docker-centos-8-stream
         - zuul-jobs-test-ensure-docker-ubuntu-bionic
         - zuul-jobs-test-build-container-image-release
@@ -514,7 +493,6 @@
         - zuul-jobs-test-ensure-podman-ubuntu-bionic
         - zuul-jobs-test-ensure-podman-ubuntu-focal
         - zuul-jobs-test-ensure-podman-debian-bullseye
-        - zuul-jobs-test-ensure-skopeo-centos-8
         - zuul-jobs-test-ensure-skopeo-fedora-35
         - zuul-jobs-test-ensure-skopeo-ubuntu-bionic
         - zuul-jobs-test-ensure-skopeo-ubuntu-focal