Ensure docker is restarted when iptables is restarted

Currently, os_firewall role may run after docker role,
and iptables.service may be restarted.  When restarted,
this negatively impacts docker's iptables rules.

This commit ensures that if iptables is restarted,
docker is restarted as well (by systemd)

Fixes: https://github.com/openshift/origin/issues/16709

roles/docker/handlers/main.yml

@@ -4,6 +4,7 @@
   systemd:
     name: "{{ openshift.docker.service_name }}"
     state: restarted
+    daemon_reload: yes
   register: r_docker_restart_docker_result
   until: not r_docker_restart_docker_result | failed
   retries: 3

roles/docker/tasks/package_docker.yml

@@ -48,7 +48,9 @@
     template:
       dest: "{{ docker_systemd_dir }}/custom.conf"
       src: custom.conf.j2
-  when: not os_firewall_use_firewalld | default(False) | bool
+    notify:
+    - restart docker
+  when: not (os_firewall_use_firewalld | default(False)) | bool
 
 - name: Add enterprise registry, if necessary
   set_fact: