Enable UFW after setting firewall rules

On fresh installs of Debian 7.6, the current order of steps will lock you
out of SSH. This will enable UFW after creating rules for http, https, ssh,
and DNS. Fix comes from @Debugreality in issue #303:

https://github.com/al3x/sovereign/issues/303

roles/common/tasks/ufw.yml

 - name: Install ufw
   apt: pkg=ufw state=present
 
-- name: Deny everything and enable UFW
-  ufw: state=enabled policy=deny
+- name: Deny everything
+  ufw: policy=deny
 
 - name: Set firewall rule for DNS
   ufw: rule=allow port=domain
     - https
     - ssh
 
+- name: Enable UFW
+  ufw: state=enabled
+
 - name: Check config of ufw
   command: cat /etc/ufw/ufw.conf
   register: ufw_config