ClearLinux: remove special casing

- put package install in system_packages
- docker should be handled by the approriate roles if used as container
  engine

roles/system_packages/vars/main.yml

@@ -27,6 +27,9 @@ pkgs:
   container-selinux:
     - "{{ ansible_os_family == 'RedHat' }}"
     - "{{ 'k8s_cluster' in group_names }}"
+  containers-basic:
+    - "{{ ansible_os_family == 'ClearLinux' }}"
+    - "{{ 'k8s_cluster' in group_names }}"
   curl: []
   device-mapper:
     - "{{ ansible_os_family == 'Suse' or ansible_distribution == 'openEuler' }}"