Fix python3-libselinux installation for RHEL/CentOS 8

In bootstrap-centos.yml we haven't gathered the facts,
so kubernetes-sigs#5127 couldn't work

Minimum ansible version to run kubespray is 2.7.8,
so ansible_distribution_major_version is defined an there is no need to default it

Signed-off-by: Etienne Champetier <[email protected]>

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

@@ -37,11 +37,16 @@
   when:
     - http_proxy is defined
 
+- name: Gather host facts to get ansible_distribution_major_version
+  setup:
+    gather_subset: '!all'
+    filter: ansible_distribution_major_version
+
 # 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 package
   package:
-    name: "{{ ( (ansible_facts.distribution_major_version | default(0) | int) < 8) | ternary('libselinux-python','python3-libselinux') }}"
+    name: "{{ ( (ansible_distribution_major_version | int) < 8) | ternary('libselinux-python','python3-libselinux') }}"
     state: present
   become: true
   when:

roles/kubernetes/preinstall/vars/centos.yml

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

roles/kubernetes/preinstall/vars/redhat.yml

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