traefik: Adjust firewalld module name to use new collection

This patch implements a change coming in the upcoming Ansible v2

roles/traefik/tasks/main.yml

@@ -82,7 +82,7 @@
     - traefik_ipv6.enabled
 
 - name: Trust our proxy network
-  firewalld:
+  ansible.posix.firewalld:
     zone: trusted
     interface: "{{ traefik_docker_bridge_name }}"
     permanent: true
@@ -133,7 +133,7 @@
   when: traefik_tor_enabled | bool
 
 - name: Allow access to services
-  firewalld:
+  ansible.posix.firewalld:
     service: "{{ item }}"
     permanent: true
     state: enabled