Comment 1 for bug 1652344

Based on what I'm seeing, we should update [1] to include the ability to keystone v3 in the [designate] config. See change for more details.

Moving this to openstack-manuals as I don't see any docs in the neutron repo that need updating as a part of this.

[1] http://docs.openstack.org/newton/networking-guide/config-dns-int.html#configuring-openstack-networking-for-integration-with-an-external-dns-service