Set TasksMax to infinity on any OS with systemd

roles/docker/tasks/systemd.yml

@@ -12,9 +12,9 @@
   when: http_proxy is defined or https_proxy is defined
 
 - name: get systemd version
-  command: rpm -q --qf '%{V}\n' systemd
+  command: systemctl --version | head -n 1 | cut -d " " -f 2
   register: systemd_version
-  when: ansible_os_family == "RedHat" and not is_atomic
+  when: not is_atomic
   changed_when: false
 
 - name: Write docker.service systemd file