Use python3-libselinux on RHEL8/Centos8 (#5127)

* Use python3-libselinux on RHEL8/Centos8

* The fact ansible_facts.distribution_major_version is not present on older Ansible version.
Default it to 0 in when not present and use libselinux-python as package to get current
default behaviour.

roles/bootstrap-os/tasks/bootstrap-centos.yml

@@ -39,9 +39,9 @@
 
 # libselinux-python is required on SELinux enabled hosts
 # See https://docs.ansible.com/ansible/latest/installation_guide/intro_installation.html#managed-node-requirements
-- name: Install libselinux-python
+- name: Install libselinux python package
   package:
-    name: libselinux-python
+    name: "{{ ( (ansible_facts.distribution_major_version | default(0) | int) < 8) | ternary('libselinux-python','python3-libselinux') }}"
     state: present
   become: true
   when:

roles/kubernetes/preinstall/vars/centos.yml

@@ -1,6 +1,6 @@
 ---
 required_pkgs:
-  - libselinux-python
+  - "{{ ( (ansible_facts.distribution_major_version | default(0) | int) < 8) | ternary('libselinux-python','python3-libselinux') }}"
   - device-mapper-libs
   - ebtables
   - nss

roles/kubernetes/preinstall/vars/redhat.yml

@@ -1,6 +1,6 @@
 ---
 required_pkgs:
-  - libselinux-python
+  - "{{ ( (ansible_facts.distribution_major_version | default(0) | int) < 8) | ternary('libselinux-python','python3-libselinux') }}"
   - device-mapper-libs
   - ebtables
   - nss