auth_version of neutron_lbaas need to be changed to version 3

[ByungYeol Woo]

Hi

I deployed octavia by using kolla-ansible.
My globals.yml is as below:

=======================================
openstack_release: "5.0.0"
enable_octavia: "yes"
enable_horizon_neutron_lbaas: "{{ enable_neutron_lbaas | bool }}"
enable_neutron_lbaas: "yes"
octavia_loadbalancer_topology: "SINGLE"
octavia_amp_boot_network_list: "3815c029-366c-49ab-8a8d-6c5536ad3f01"
octavia_amp_secgroup_list: "b3ecf707-030f-4523-8543-d716820b7529"
octavia_amp_flavor_id: "cdfe552f-5eb7-4d23-a2e4-6d2d76cad5be"
=======================================

I created secret keys, network, amphora image, flavor, security groups manualy.
And I tried to make loadbalancer, but I found auth errors as below:

=======================================
2017-12-13 17:04:18.933 25 ERROR neutron_lbaas.services.loadbalancer.plugin [req-5cc77ba5-f93a-4c86-b5f6-d93e4c934a4c 578d8f8561aa4d87960d70ce522fbfd2 48f5294c7beb4260b721bc0106e78e4c - default defa
ult] There was an error in the driver: NotFound: (http://222.122.40.50:5000/v2.0/tokens): The resource could not be found. (HTTP 404) (Request-ID: req-dbc8fca4-9f15-4bd7-9853-6c41ec6c000f)

2017-12-13 17:04:18.933 25 ERROR neutron_lbaas.services.loadbalancer.plugin NotFound: (http://222.122.40.50:5000/v2.0/tokens): The resource could not be found. (HTTP 404) (Request-ID: req-dbc8fca4-9
f15-4bd7-9853-6c41ec6c000f)
=======================================

I found this problem was due to auth version of neutron_lbaas.conf.
I think auth_url and auth_version need to be changed to version 3 of "kolla-ansible/ansible/roles/neutron/templates/neutron_lbaas.conf.j2"

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/569921
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=438ae3b640f9a61fc409f1f317da8437e065cd3b
Submitter: Zuul
Branch: master

commit 438ae3b640f9a61fc409f1f317da8437e065cd3b
Author: Cong Ha Minh <email address hidden>
Date: Tue May 22 11:07:22 2018 +0700

    Use lbproxy instead of lbagent in neutron when deploy Octavia

    Disable neutron-lbaas-agent and use lbaasv2-proxy when enable octavia.
    Use keystone-auth v3 and internal endpoint for lbaasv2 plugin.

    Change-Id: I69e8436f3722cf99644457323b71b94dc9036bb9
    Co-Authored-By: Hieu LE <email address hidden>
    Closes-Bug: #1756771
    Closes-Bug: #1738115

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/kolla-ansible 7.0.0.0rc1 release candidate.