Comment 1 for bug 1811238

Perhaps a duplicate of this old one: https://bugs.launchpad.net/neutron/+bug/1785025 (Install and configure controller node in Neutron).

I changed the doc: https://review.openstack.org/589907, but was recently reverted:
https://review.openstack.org/#/c/628878/

So if I understand well from Akihiro's commit message: "This commit was approved just to keep the consistency with other OpenStack projects, but most proposed changes related to it have been rejected so far. The main reason is because it is clearer to specify options explicitly and we should not assume some configuration. I totally agree these opinions and see no reason that neutron
contineus to use different command line options for mysql. Consistency in the installation guide will bring better user experience."

So perhaps this bug can be rejected.