roles/common: Add firewalld support

Needed in Ubuntu 15.04 where iptables-persistent is going away. I
have added translations of the current IPv4 and IPv6 iptables rules.

Signed-off-by: Alan Orth <alan.orth@gmail.com>

roles/common/handlers/main.yml

@@ -12,3 +12,6 @@
 
 - name: reload sysctl
   command: sysctl -p /etc/sysctl.conf
+
+- name: restart firewalld
+  service: name=firewalld state=restarted