fix(bootstrap-os): do not install pkgs requirements on flatcar (#11224)

Fix regression added in 663fcd10 for
flatcar nodes.

See: https://github.com/kubernetes-sigs/kubespray/commit/663fcd104c38ddc2bf8c023f6f6b3705048d531e

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