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 [1].
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.
[1] https://review.openstack.org/#/q/file:%255Edoc/source/install/.*+message:mysql
This reverts commit 59d178c9de6028016053f2a6958372e14ded386a.
Related-Bug: #1785025
Change-Id: I699d03de9e26d5784e6bd5e7d4fa219de6209207
bc29d4843d