Cleanup of kubernetes/preinstall (#11010)

* Move fedora ansible python install to bootstrap-os

* /bin/dir is set in bootstrap-os

* Removing ansible_os_family workarounds

Support for these distributions was merged in Ansible, no need to
override it ourselves now.
https://github.com/ansible/ansible/pull/69324 openEuler
https://github.com/ansible/ansible/pull/77275/ UnionTech OS Server 20
https://github.com/ansible/ansible/pull/78232/ Kylin

* Don't unconditionnaly set VARIANT_ID=coreos in os-release

WTF, this is so wrong.
Furthermore, is_fedora_coreos is already handled in boostrap-os

* Handle Clearlinux generically

Followup of 4eec302e86 (since we're using
package module anyway, let's get rid of the custom task)

roles/kubernetes/preinstall/tasks/0020-set_facts.yml

@@ -1,11 +1,4 @@
 ---
-- name: Force binaries directory for Flatcar Container Linux by Kinvolk
-  set_fact:
-    bin_dir: "/opt/bin"
-  when: ansible_os_family in ["Flatcar", "Flatcar Container Linux by Kinvolk"]
-  tags:
-    - facts
-
 - name: Set os_family fact for other redhat-based operating systems
   set_fact:
     ansible_os_family: "RedHat"
@@ -14,34 +7,6 @@
   tags:
     - facts
 
-- name: Set os_family fact for other debian-based operating systems
-  set_fact:
-    ansible_os_family: "Debian"
-  when: ansible_distribution in debian_os_family_extensions
-  tags:
-    - facts
-
-- name: Check if booted with ostree
-  stat:
-    path: /run/ostree-booted
-    get_attributes: no
-    get_checksum: no
-    get_mime: no
-  register: ostree
-
-- name: Set is_fedora_coreos
-  lineinfile:
-    path: /etc/os-release
-    line: "VARIANT_ID=coreos"
-    state: present
-  check_mode: yes
-  register: os_variant_coreos
-  changed_when: false
-
-- name: Set is_fedora_coreos
-  set_fact:
-    is_fedora_coreos: "{{ ostree.stat.exists and os_variant_coreos is not changed }}"
-
 - name: Check resolvconf
   command: which resolvconf
   register: resolvconf