Drop install of python-libselinux for RHEL family below 8

RHEL 7 and derivates support has been removed from some time, clean up
of leftovers.

roles/bootstrap-os/tasks/centos.yml

@@ -108,11 +108,3 @@
   when:
     - fastestmirror.stat.exists
     - not centos_fastestmirror_enabled
-
-# 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_distribution_major_version | int) < 8) | ternary('libselinux-python', 'python3-libselinux') }}"
-    state: present
-  become: true

roles/bootstrap-os/tasks/rhel.yml

@@ -93,11 +93,3 @@
   when:
     - fastestmirror.stat.exists
     - not centos_fastestmirror_enabled
-
-# 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_distribution_major_version | int) < 8) | ternary('libselinux-python', 'python3-libselinux') }}"
-    state: present
-  become: true

roles/system_packages/vars/main.yml

@@ -58,7 +58,7 @@ pkgs:
   libseccomp2:
     - "{{ ansible_os_family in ['Debian', 'Suse'] }}"
     - "{{ 'k8s_cluster' in group_names }}"
-  libselinux-python:  # TODO: Handle rehat_family + major < 8
+  libselinux-python:
     - "{{ ansible_distribution == 'Amazon' }}"
   libselinux-python3:
     - "{{ ansible_distribution == 'Fedora' }}"