don't add docker to trusted zone

Adding docker0 to a trusted zone creates issues with the latest docker
pkg. The daemon handles firewalld itself and errors since the interface is
already in zone trusted and thus can't be handled by it's own zone.

roles/gitlab_runner/tasks/main.yml

@@ -7,12 +7,6 @@
 - name: start docker
   systemd: name=docker enabled=yes state=started daemon_reload=yes
 
-- name: make docker0 interface trusted
-  ansible.posix.firewalld: interface=docker0 zone=trusted permanent=true state=enabled immediate=yes
-  when: configure_firewall
-  tags:
-    - firewall
-
 - name: configure Docker daemon for IPv6
   copy: src=daemon.json dest=/etc/docker/daemon.json owner=root group=root mode=0644
   notify: restart docker