Add support for atomic host

Updates based on feedback

Simplify checks for file exists

remove invalid char

Review feedback. Use regular systemd file.

Add template for docker systemd atomic

roles/kubernetes/preinstall/tasks/main.yml

@@ -91,7 +91,7 @@
   yum:
     update_cache: yes
     name: '*'
-  when: ansible_pkg_mgr == 'yum'
+  when: ansible_pkg_mgr == 'yum' and not is_atomic
   tags: bootstrap-os
 
 - name: Install latest version of python-apt for Debian distribs
@@ -112,7 +112,7 @@
 
 - name: Install epel-release on RedHat/CentOS
   shell: rpm -qa | grep epel-release || rpm -ivh {{ epel_rpm_download_url }}
-  when: ansible_distribution in ["CentOS","RedHat"]
+  when: ansible_distribution in ["CentOS","RedHat"] and not is_atomic
   changed_when: False
   check_mode: no
   tags: bootstrap-os
@@ -127,7 +127,7 @@
   retries: 4
   delay: "{{ retry_stagger | random + 3 }}"
   with_items: "{{required_pkgs | default([]) | union(common_required_pkgs|default([]))}}"
-  when: not ansible_os_family in ["CoreOS", "Container Linux by CoreOS"]
+  when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS"] or is_atomic)
   tags: bootstrap-os
 
 # Todo : selinux configuration