Fix the path of firewall plugin in kolla-ansible.
Fix the path of firewall plugin in kolla-ansible.

The path of firewall plugin in kolla-ansible is wrong.

Change-Id: I979af769d8bc31e3b6373a629e9e090b987d0058
Closes-Bug: #1684459

dardelean/kolla-ansible,dardelean/kolla-ansible,dardelean/kolla-ansible