kolla-kubernetes build guide failure - kolla-ansible mismatch

Originally filed bug under https://bugs.launchpad.net/kolla-ansible/+bug/1693014.

Just deployed Kolla following guide at https://docs.openstack.org/developer/kolla-kubernetes/deployment-guide.html

Problem is that neutron-dhcp-agent, neutron-l3-agent, and neutron-metadata-agent all fail to start because the ml2-conf.ini key is missing from the generated configMap.

The cause is a mismatch between kolla-ansible and kolla-kubernetes. Both contain a file named 'ansible/roles/neutron/tasks/config.yml' and the two files are different. Specifically, see services_need_ml2_conf_ini (file https://github.com/andybrucenet/kolla-ansible/blob/dec8fbd7a463ab58d5d5455fcfc45b0302c1a707/ansible/roles/neutron/tasks/config.yml)

I created a fork of kolla-ansible at https://github.com/andybrucenet/kolla-ansible and submitted a bug report. The maintainer indicated that this is not a real problem (you can see the maintainer's remarks in the bug link up top).

Because kolla-kubernetes appears to have a dependency on kolla-ansible, it is important that both teams agree on whether or not ml2_conf.ini is needed for a successful bare metal deployment.

Under the kolla-kubernetes file system, we find:

# helm/microservice/neutron-dhcp-agent-daemonset/templates/dhcp-agent-daemonset.yaml
 21 apiVersion: extensions/v1beta1
 22 kind: DaemonSet
 23 metadata:
 24 name: neutron-dhcp-agent
 25 labels:
 26 component: neutron
 27 system: dhcp-agent
...
117 - name: neutron-dhcp-agent-configmap
118 configMap:
119 name: neutron-dhcp-agent
120 items:
121 - key: neutron.conf
122 path: neutron.conf
123 - key: config.json
124 path: config.json
125 - key: ml2-conf.ini
126 path: ml2_conf.ini
127 - key: dhcp-agent.ini
128 path: dhcp_agent.ini
129 - key: dnsmasq.conf
130 path: dnsmasq.conf

One can see the dependency that kolla-kubernetes has on ml2_conf.ini. Additionally, that same yaml file has other commands (such as crudini) that set variables within ml2_conf.ini.

Please let me know if I should modify my kolla-kubernetes fork to remove all dependencies on ml2_conf.ini from:

* neutron-dhcp-agent
* neutron-l3-agent
* neutron-lbaas-agent
* neutron-metadata-agent
* neutron-vpnaas-agent

Please see https://github.com/openstack/kolla-ansible/compare/master...andybrucenet:master for details on neutron microservices in kolla-kubernetes currently requiring ml2_conf.ini