Add centos-8 support

renaming redhat-7.yml to redhat.yml to support centos-8. (setting non-voting to break telemetry dependency)

Change-Id: I95c2c7c158cfcad6746188b24a0e06ffd2564244

vars/redhat.yml

@@ -19,7 +19,7 @@ gnocchi_distro_packages:
   - git
   - librados2-devel
   - postgresql-devel
-  - python-devel
+  - "{{ ansible_distribution_major_version is version('8', '<') | ternary('python-devel', 'python36-devel') }}"
   - systemd-devel
   - which
 

zuul.d/project.yaml

@@ -21,3 +21,19 @@
       - openstack-ansible-deploy-aio_distro_metal-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
+    check:
+      jobs:
+        - openstack-ansible-deploy-aio_metal-centos-8:
+            voting: false
+        - openstack-ansible-deploy-aio_distro_metal-centos-8:
+            voting: false
+        - openstack-ansible-deploy-aio_metal-ubuntu-focal:
+            voting: false
+    gate:
+      jobs:
+        - openstack-ansible-deploy-aio_metal-centos-8:
+            voting: false
+        - openstack-ansible-deploy-aio_distro_metal-centos-8:
+            voting: false
+        - openstack-ansible-deploy-aio_metal-ubuntu-focal:
+            voting: false