Remove support for CoreOS Container Linux (#6576)

roles/kubernetes-apps/external_provisioner/local_volume_provisioner/README.md

@@ -118,7 +118,7 @@ delete the daemonset pod on the relevant host after creating volumes. The pod
 will be recreated and read the size correctly.
 
 Make sure to make any mounts persist via /etc/fstab or with systemd mounts (for
-CoreOS/Container Linux and Flatcar). Pods with persistent volume claims will not be
+Flatcar Container Linux). Pods with persistent volume claims will not be
 able to start if the mounts become unavailable.
 
 Further reading

roles/kubernetes-apps/helm/tasks/install_host.yml

@@ -35,8 +35,8 @@
   retries: 4
   delay: "{{ retry_stagger | random + 3 }}"
 
-- name: Helm | Copy socat wrapper for Container Linux and Flatcat
+- name: Helm | Copy socat wrapper for Flatcar Container Linux by Kinvolk
   command: "{{ docker_bin_dir }}/docker run --rm -v {{ bin_dir }}:/opt/bin {{ install_socat_image_repo }}:{{ install_socat_image_tag }}"
   args:
     creates: "{{ bin_dir }}/socat"
-  when: ansible_os_family in ['CoreOS', 'Container Linux by CoreOS', 'Flatcar', 'Flatcar Container Linux by Kinvolk']
+  when: ansible_os_family in ['Flatcar Container Linux by Kinvolk']

roles/kubernetes-apps/helm/tasks/main.yml

@@ -126,4 +126,4 @@
   shell: "umask 022 && {{ bin_dir }}/helm completion bash >/etc/bash_completion.d/helm.sh"
   when:
     - ((helm_container is defined and helm_container.changed) or (helm_task_result is defined and helm_task_result.changed))
-    - not ansible_os_family in ["CoreOS", "Coreos", "Container Linux by CoreOS", "Flatcar", "Flatcar Container Linux by Kinvolk"]
+    - not ansible_os_family in ["Flatcar Container Linux by Kinvolk"]