fix(bootstrap-os): do not install pkgs requirements on flatcar (#11252)

Fix regression added in 663fcd104c for
flatcar nodes.

See: 663fcd104c

Co-authored-by: Anthony Delannoy <adelannoy@wiremind.io>

roles/kubernetes/preinstall/tasks/0070-system-packages.yml

@@ -82,5 +82,6 @@
   until: pkgs_task_result is succeeded
   retries: "{{ pkg_install_retries }}"
   delay: "{{ retry_stagger | random + 3 }}"
+  when: not (ansible_os_family in ["Flatcar", "Flatcar Container Linux by Kinvolk"] or is_fedora_coreos)
   tags:
     - bootstrap-os