updated to support all OSes using systemd

roles/docker/tasks/main.yml

@@ -54,9 +54,8 @@
   when: docker_package_info.pkgs|length > 0
 
 - name: allow for proxies on RHEL systems
-  include: rhel-proxies.yml
-  when: ansible_distribution in ["CentOS","RedHat"] and
-        ansible_distribution_major_version >= 7 and
+  include: systemd-proxies.yml
+  when: ansible_service_mgr == "systemd" and
         (http_proxy is defined or https_proxy is defined or no_proxy is defined)
 
 - meta: flush_handlers