Remove references to unsupported operating systems

All references to Gentoo, SUSE, Debian stretch and Centos-7  are removed.
Conditional tasks, ternary operators and variables are simplified where possible
OS specific variables files are generalised where possible

Change-Id: I59e808ff2dc75e36890d271db0ba7f40f9c108ed

meta/main.yml

@@ -22,19 +22,14 @@ galaxy_info:
   platforms:
     - name: Debian
       versions:
-        - stretch
+        - buster
     - name: Ubuntu
       versions:
-        - xenial
         - bionic
+        - focal
     - name: EL
       versions:
-        - 7
+        - 8
-    - name: opensuse
-      versions:
-        - 42.1
-        - 42.2
-        - 42.3
   categories:
     - cloud
     - python

tasks/zun_compute.yml

@@ -13,17 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-- name: Add zypper repository
-  zypper_repository:
-    auto_import_keys: yes
-    autorefresh: yes
-    name: "{{ item.name }}"
-    repo: "{{ item.uri }}"
-    runrefresh: yes
-  with_items: "{{ zun_docker_repo }}"
-  when:
-    - ansible_pkg_mgr == 'zypper'
-
 - name: Run apt install block
   block:
     - name: Run the apt package pinning role
@@ -101,7 +90,7 @@
   delay: 2
   with_items: "{{ zun_docker_repo }}"
   when:
-    - ansible_pkg_mgr in ['yum', 'dnf']
+    - ansible_pkg_mgr == 'dnf'
 
 - name: Enable module_hotfixes
   lineinfile:
@@ -112,15 +101,14 @@
   with_items: "{{ zun_docker_repo }}"
   when:
     - ansible_os_family | lower == 'redhat'
-    - ansible_distribution_major_version is version('8', '>=')
 
 - name: Install compute distro packages
   package:
     name: "{{ zun_distro_compute_packages }}"
     state: "{{ zun_package_state }}"
-    update_cache: "{{ (ansible_pkg_mgr in ['apt', 'zypper']) | ternary('yes', omit) }}"
+    update_cache: "{{ (ansible_pkg_mgr == 'apt') | ternary('yes', omit) }}"
     cache_valid_time: "{{ (ansible_pkg_mgr == 'apt') | ternary(cache_timeout, omit) }}"
-    enablerepo: "{{ (ansible_pkg_mgr in ['yum', 'dnf']) | ternary('extras', omit) }}"
+    enablerepo: "{{ (ansible_pkg_mgr == 'dnf') | ternary('extras', omit) }}"
 
 - name: Ensure the containerd config directory exists
   file:

vars/suse.yml

@@ -1,32 +0,0 @@
----
-# Copyright 2018, 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.
-
-zun_docker_repo:
-  - name: "OBS:Virtualization:containers"
-    uri: "http://download.opensuse.org/repositories/Virtualization:/containers/openSUSE_Leap_{{ ansible_distribution_version }}/"
-
-# Common zypp packages
-zun_distro_packages:
-  - device-mapper-persistent-data
-  - git
-  - yum-utils
-  - lvm2
-  - systemd-devel
-
-zun_distro_compute_packages:
-  - docker-ce
-  - pciutils
-
-zun_docker_groupname: dockerroot