CentOS 8 support

Dependant patch [1] passes openstack_hosts step, so we're good to merge
even with failing functional test not to make circular dependency.

[1] https://review.opendev.org/#/c/689629/

Depens-On: https://review.opendev.org/#/c/728259/
Change-Id: If33ce6f55939ee7722bbab98d134f182cba0eb25

defaults/main.yml

@@ -149,8 +149,8 @@ openstack_host_sysstat_cron_mode: '0755'
 # NOTE(mhayden): Ensure that the full path to the 'centos' directory is used.
 openstack_hosts_centos_mirror_url: 'http://mirror.centos.org/centos'
 openstack_hosts_rdo_mirror_url: 'https://trunk.rdoproject.org'
-openstack_hosts_rdo_repo_url: "{{ openstack_hosts_rdo_mirror_url }}/centos7-master/current-passed-ci/"
-openstack_hosts_rdo_deps_url: "{{ openstack_hosts_rdo_mirror_url }}/centos7-master/deps/latest/"
+openstack_hosts_rdo_repo_url: "{{ openstack_hosts_rdo_mirror_url }}/centos{{ ansible_distribution_major_version }}-master/current-passed-ci/"
+openstack_hosts_rdo_deps_url: "{{ openstack_hosts_rdo_mirror_url }}/centos{{ ansible_distribution_major_version }}-master/deps/latest/"
 
 # Default opensuse mirrors URLs
 opensuse_mirror: "http://download.opensuse.org"

tasks/openstack_hosts_configure_dnf.yml

@@ -89,3 +89,15 @@
   until: _adding_repo  is success
   retries: 5
   delay: 2
+
+- name: Add rdo repositories via url
+  get_url:
+    url: "{{ openstack_hosts_rdo_repo_url }}/delorean.repo"
+    dest: /etc/yum.repos.d/rdo.repo
+  register: _get_repo
+  until: _get_repo  is success
+  retries: 5
+  delay: 2
+  when:
+    - ansible_os_family | lower == 'redhat'
+    - ansible_distribution_major_version is version('8', '=')

tests/test-create-ca.yml

@@ -29,7 +29,7 @@
       - gnutls-utils
     state: present
   when:
-    - ansible_pkg_mgr == 'yum'
+    - ansible_distribution == "CentOS"
 
 - name: Install ssl packages (ubuntu)
   package:

vars/redhat-8.yml

@@ -0,0 +1,100 @@
+---
+# Copyright 2016, Rackspace US, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+## Defined required kernel
+openstack_host_required_kernel: 4.18.0
+openstack_host_sysstat_file: /etc/sysconfig/sysstat
+openstack_host_sysstat_cron_file: /etc/cron.d/sysstat
+openstack_host_cron_template: sysstat.cron.redhat.j2
+openstack_host_module_file: /etc/modules-load.d/openstack-ansible.conf
+
+openstack_host_sysstat_cron_mode: '0600'
+
+## Kernel modules loaded on hosts
+openstack_host_kernel_modules:
+  - name: 8021q
+  - name: br_netfilter
+  - name: dm_multipath
+  - name: dm_snapshot
+  - name: ebtables
+  - name: ip6table_filter
+  - name: ip6_tables
+  - name: ip_tables
+  - name: ipt_MASQUERADE
+  - name: ipt_REJECT
+  - name: iptable_filter
+  - name: iptable_mangle
+  - name: iptable_nat
+  - name: ip_vs
+  - name: iscsi_tcp
+  - name: nf_conntrack
+  - name: "{{ (hostvars[inventory_hostname]['ansible_kernel'] is version('4.19', '<=')) | ternary('nf_conntrack_ipv4' ,'') }}"
+  - name: "{{ (hostvars[inventory_hostname]['ansible_kernel'] is version('4.19', '<=')) | ternary('nf_conntrack_ipv6' ,'') }}"
+  - name: nf_defrag_ipv4
+  - name: nf_nat
+  - name: nf_nat_ipv4
+  - name: vhost_net
+
+## Base packages
+_openstack_host_distro_packages:
+  - python3-virtualenv
+  - python3-devel
+
+## Bare metal base packages
+_openstack_host_metal_distro_packages:
+  - cronie
+  - curl
+  - device-mapper-event
+  - dstat
+  - ebtables
+  - git
+  - iptables
+  - irqbalance
+  - kmod-libs
+  - kmod
+  - libselinux-python3
+  - lvm2
+  - rsync
+  - rsyslog
+  - sysstat
+  - sudo
+  - time
+  - wget
+  - yum-utils
+
+_package_repos_keys:
+  - name: openstack-queens
+    key: /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Cloud
+    keyfile: "gpg/764429E6"
+  - name: rdo-qemu-ev
+    key: /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Virtualization-RDO
+    keyfile: "gpg/61E8806C"
+
+_package_list:
+  - name: epel-release
+    state: absent
+  - name: "centos-openstack-release-*"
+    state: absent
+  - name: centos-release-storage-common
+    state: absent
+
+_package_repos:
+  - name: rdo-deps
+    file: rdo-deps
+    description: rdo-deps
+    baseurl: "{{ openstack_hosts_rdo_deps_url }}"
+    gpgcheck: no
+
+_openstack_host_ca_location: /etc/pki/ca-trust/source/anchors/